diff --git a/app/Modules/Files/Http/Controllers/PublicShareController.php b/app/Modules/Files/Http/Controllers/PublicShareController.php
index 4f41a96e..4ff68313 100644
--- a/app/Modules/Files/Http/Controllers/PublicShareController.php
+++ b/app/Modules/Files/Http/Controllers/PublicShareController.php
@@ -12,6 +12,7 @@ use App\Modules\Files\Delivery\StoredFileResponse;
 use App\Modules\Files\Models\Category;
 use App\Modules\Files\Models\File;
 use App\Modules\Files\Scanning\FileAvailability;
+use App\Modules\Files\Scanning\ScanningConfig;
 use App\Modules\Files\Scanning\ScanStatus;
 use App\Modules\Files\Models\ShareLink;
 use Illuminate\Http\RedirectResponse;
@@ -32,6 +33,7 @@ class PublicShareController extends Controller
         private readonly DownloadAllowance $allowance,
         private readonly StoredFileResponse $bytes,
         private readonly FileAvailability $availability,
+        private readonly ScanningConfig $scanning,
     ) {}
 
     public function show(string $token): InertiaResponse
@@ -84,6 +86,11 @@ class PublicShareController extends Controller
                     ])->values()->all(),
             ],
             'download_url' => route('share.download', $token),
+            // Said to the one person who can neither see the setting nor
+            // chose it. The uploader and the staff library both show this
+            // file as "not scanned"; whoever follows the link had no way
+            // of knowing.
+            'unscanned' => $this->scanning->enabled() && $file->wasLetThrough(),
         ]);
     }
 
diff --git a/app/Modules/Files/Models/File.php b/app/Modules/Files/Models/File.php
index cd7168b9..14e9477b 100644
--- a/app/Modules/Files/Models/File.php
+++ b/app/Modules/Files/Models/File.php
@@ -319,6 +319,21 @@ class File extends Model
         });
     }
 
+    /**
+     * Why a file went out unchecked. Deliberately not
+     * NotScannedReason::BeforeScanning: a file stored while this
+     * installation did not scan at all is not a scanner letting something
+     * past, and on an installation that has never scanned it would mean
+     * saying it about every file there is.
+     *
+     * @var list<string>
+     */
+    private const LET_THROUGH_REASONS = [
+        NotScannedReason::ScannerUnavailable->value,
+        NotScannedReason::TooLarge->value,
+        NotScannedReason::Encrypted->value,
+    ];
+
     /**
      * Files people can download that nothing checked: let through while
      * the scanner was down, or because it could not open them.
@@ -334,11 +349,17 @@ class File extends Model
     public function scopeLetThrough(Builder $query): void
     {
         $query->where('scan_status', ScanStatus::NotScanned)
-            ->whereIn('scan_note', [
-                NotScannedReason::ScannerUnavailable->value,
-                NotScannedReason::TooLarge->value,
-                NotScannedReason::Encrypted->value,
-            ]);
+            ->whereIn('scan_note', self::LET_THROUGH_REASONS);
+    }
+
+    /**
+     * Whether this particular file is one of those — the row's own answer
+     * to scopeLetThrough(), for a page that already has the file.
+     */
+    public function wasLetThrough(): bool
+    {
+        return $this->scan_status === ScanStatus::NotScanned
+            && in_array((string) $this->scan_note, self::LET_THROUGH_REASONS, true);
     }
 
     /**
diff --git a/app/Modules/Groups/Http/Controllers/PublicGroupsController.php b/app/Modules/Groups/Http/Controllers/PublicGroupsController.php
index 5a6da881..307e941c 100644
--- a/app/Modules/Groups/Http/Controllers/PublicGroupsController.php
+++ b/app/Modules/Groups/Http/Controllers/PublicGroupsController.php
@@ -14,6 +14,7 @@ use App\Modules\Files\Delivery\StoredFileResponse;
 use App\Modules\Files\Models\Category;
 use App\Modules\Files\Models\File;
 use App\Modules\Files\Scanning\FileAvailability;
+use App\Modules\Files\Scanning\ScanningConfig;
 use App\Modules\Files\Models\Folder;
 use App\Modules\Files\Preview\PreviewKind;
 use App\Modules\Files\Preview\PreviewLog;
@@ -228,6 +229,9 @@ class PublicGroupsController extends Controller
             // is allowed.
             'preview_url' => $this->previewUrlFor($file, $publicSlug),
             'download_url' => route('public.download', [$publicSlug, $file->slug]),
+            // See PublicShareController::show — the same sentence, to the
+            // same person, on the other public surface.
+            'unscanned' => app(ScanningConfig::class)->enabled() && $file->wasLetThrough(),
             // Same decided shape the listings send, so a theme's single
             // file page disables its button for the same reason a row
             // does — see DownloadAllowance::summaryFor.
diff --git a/lang/ca.json b/lang/ca.json
index 94c0def5..897e15ae 100644
--- a/lang/ca.json
+++ b/lang/ca.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Un fitxer d'aquest arxiu ja no està disponible. Torna a descarregar la selecció.",
     "A scan is already running. Wait for it to finish.": "Ja hi ha una anàlisi en curs. Espera que acabi.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Alguna cosa ha respost a :address, però no és un escàner ClamAV.",
-    "Available until :date": "Disponible fins al :date"
+    "Available until :date": "Disponible fins al :date",
+    "This file was not checked for viruses.": "Aquest fitxer no s'ha analitzat a la recerca de virus."
 }
diff --git a/lang/cs.json b/lang/cs.json
index 9f15ddd6..4759357b 100644
--- a/lang/cs.json
+++ b/lang/cs.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Soubor z tohoto archivu už není k dispozici. Stáhněte výběr znovu.",
     "A scan is already running. Wait for it to finish.": "Kontrola už probíhá. Počkejte, až skončí.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Na adrese :address něco odpovědělo, ale není to skener ClamAV.",
-    "Available until :date": "K dispozici do :date"
+    "Available until :date": "K dispozici do :date",
+    "This file was not checked for viruses.": "Tento soubor nebyl zkontrolován na viry."
 }
diff --git a/lang/de.json b/lang/de.json
index 9ac6554a..9bb1d573 100644
--- a/lang/de.json
+++ b/lang/de.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Eine Datei in diesem Archiv ist nicht mehr verfügbar. Lade die Auswahl erneut herunter.",
     "A scan is already running. Wait for it to finish.": "Es läuft bereits ein Scan. Warte, bis er fertig ist.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Unter :address hat etwas geantwortet, aber es ist kein ClamAV-Scanner.",
-    "Available until :date": "Verfügbar bis :date"
+    "Available until :date": "Verfügbar bis :date",
+    "This file was not checked for viruses.": "Diese Datei wurde nicht auf Viren geprüft."
 }
diff --git a/lang/es.json b/lang/es.json
index a9a08d6d..f4b9ec42 100644
--- a/lang/es.json
+++ b/lang/es.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Un archivo de este comprimido ya no está disponible. Vuelve a descargar la selección.",
     "A scan is already running. Wait for it to finish.": "Ya hay un análisis en curso. Espera a que termine.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Algo respondió en :address, pero no es un analizador ClamAV.",
-    "Available until :date": "Disponible hasta el :date"
+    "Available until :date": "Disponible hasta el :date",
+    "This file was not checked for viruses.": "Este archivo no fue analizado en busca de virus."
 }
diff --git a/lang/fr.json b/lang/fr.json
index 691c9dde..5a2429b0 100644
--- a/lang/fr.json
+++ b/lang/fr.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Un fichier de cette archive n'est plus disponible. Téléchargez à nouveau la sélection.",
     "A scan is already running. Wait for it to finish.": "Une analyse est déjà en cours. Attendez qu'elle se termine.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Quelque chose a répondu à :address, mais ce n'est pas un scanner ClamAV.",
-    "Available until :date": "Disponible jusqu'au :date"
+    "Available until :date": "Disponible jusqu'au :date",
+    "This file was not checked for viruses.": "Ce fichier n'a pas été analysé à la recherche de virus."
 }
diff --git a/lang/id.json b/lang/id.json
index 62ae56ff..ea0918c7 100644
--- a/lang/id.json
+++ b/lang/id.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Sebuah file dalam arsip ini sudah tidak tersedia. Unduh ulang pilihan tersebut.",
     "A scan is already running. Wait for it to finish.": "Pemindaian sudah berjalan. Tunggu hingga selesai.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Ada yang menjawab di :address, tetapi itu bukan pemindai ClamAV.",
-    "Available until :date": "Tersedia hingga :date"
+    "Available until :date": "Tersedia hingga :date",
+    "This file was not checked for viruses.": "Berkas ini belum dipindai dari virus."
 }
diff --git a/lang/it.json b/lang/it.json
index 9108d7af..44c159a2 100644
--- a/lang/it.json
+++ b/lang/it.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Un file di questo archivio non è più disponibile. Scarica di nuovo la selezione.",
     "A scan is already running. Wait for it to finish.": "È già in corso una scansione. Attendi che finisca.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Qualcosa ha risposto su :address, ma non è uno scanner ClamAV.",
-    "Available until :date": "Disponibile fino al :date"
+    "Available until :date": "Disponibile fino al :date",
+    "This file was not checked for viruses.": "Questo file non è stato controllato alla ricerca di virus."
 }
diff --git a/lang/ja.json b/lang/ja.json
index c3892cae..87cfb509 100644
--- a/lang/ja.json
+++ b/lang/ja.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "このアーカイブ内のファイルは利用できなくなりました。もう一度選択をダウンロードしてください。",
     "A scan is already running. Wait for it to finish.": "スキャンはすでに実行中です。終了するまでお待ちください。",
     "Something answered at :address, but it is not a ClamAV scanner.": ":address で応答がありましたが、ClamAV スキャナーではありません。",
-    "Available until :date": ":date まで利用可能"
+    "Available until :date": ":date まで利用可能",
+    "This file was not checked for viruses.": "このファイルはウイルス検査を受けていません。"
 }
diff --git a/lang/nl.json b/lang/nl.json
index d4c981de..69112b43 100644
--- a/lang/nl.json
+++ b/lang/nl.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Een bestand in dit archief is niet meer beschikbaar. Download de selectie opnieuw.",
     "A scan is already running. Wait for it to finish.": "Er loopt al een scan. Wacht tot die klaar is.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Er antwoordde iets op :address, maar het is geen ClamAV-scanner.",
-    "Available until :date": "Beschikbaar tot :date"
+    "Available until :date": "Beschikbaar tot :date",
+    "This file was not checked for viruses.": "Dit bestand is niet op virussen gecontroleerd."
 }
diff --git a/lang/pl.json b/lang/pl.json
index 25a7f066..b49a7ed6 100644
--- a/lang/pl.json
+++ b/lang/pl.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Plik z tego archiwum nie jest już dostępny. Pobierz zaznaczenie ponownie.",
     "A scan is already running. Wait for it to finish.": "Skanowanie już trwa. Poczekaj, aż się zakończy.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Coś odpowiedziało pod adresem :address, ale to nie jest skaner ClamAV.",
-    "Available until :date": "Dostępny do :date"
+    "Available until :date": "Dostępny do :date",
+    "This file was not checked for viruses.": "Ten plik nie został sprawdzony pod kątem wirusów."
 }
diff --git a/lang/pt_BR.json b/lang/pt_BR.json
index bdeef033..1c36933d 100644
--- a/lang/pt_BR.json
+++ b/lang/pt_BR.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Um arquivo deste pacote não está mais disponível. Baixe a seleção novamente.",
     "A scan is already running. Wait for it to finish.": "Já há uma verificação em andamento. Aguarde até que termine.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Algo respondeu em :address, mas não é um scanner ClamAV.",
-    "Available until :date": "Disponível até :date"
+    "Available until :date": "Disponível até :date",
+    "This file was not checked for viruses.": "Este arquivo não foi verificado em busca de vírus."
 }
diff --git a/lang/ru.json b/lang/ru.json
index 1fc1b592..ff108942 100644
--- a/lang/ru.json
+++ b/lang/ru.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Один из файлов этого архива больше недоступен. Скачайте выбранное заново.",
     "A scan is already running. Wait for it to finish.": "Проверка уже идёт. Дождитесь её завершения.",
     "Something answered at :address, but it is not a ClamAV scanner.": "По адресу :address что-то ответило, но это не сканер ClamAV.",
-    "Available until :date": "Доступен до :date"
+    "Available until :date": "Доступен до :date",
+    "This file was not checked for viruses.": "Этот файл не проверялся на вирусы."
 }
diff --git a/lang/sw.json b/lang/sw.json
index 58cbf719..2335363a 100644
--- a/lang/sw.json
+++ b/lang/sw.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Faili moja katika kumbukumbu hii halipatikani tena. Pakua uteuzi upya.",
     "A scan is already running. Wait for it to finish.": "Uchanganuzi tayari unaendelea. Subiri umalizike.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Kitu kimejibu kwenye :address, lakini si kichanganuzi cha ClamAV.",
-    "Available until :date": "Inapatikana hadi :date"
+    "Available until :date": "Inapatikana hadi :date",
+    "This file was not checked for viruses.": "Faili hii haijakaguliwa dhidi ya virusi."
 }
diff --git a/lang/tr.json b/lang/tr.json
index 86ed60df..3342774f 100644
--- a/lang/tr.json
+++ b/lang/tr.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Bu arşivdeki bir dosya artık kullanılamıyor. Seçimi yeniden indirin.",
     "A scan is already running. Wait for it to finish.": "Zaten bir tarama çalışıyor. Bitmesini bekleyin.",
     "Something answered at :address, but it is not a ClamAV scanner.": ":address adresinde bir şey yanıt verdi, ancak bu bir ClamAV tarayıcısı değil.",
-    "Available until :date": ":date tarihine kadar kullanılabilir"
+    "Available until :date": ":date tarihine kadar kullanılabilir",
+    "This file was not checked for viruses.": "Bu dosya virüslere karşı taranmadı."
 }
diff --git a/lang/vi.json b/lang/vi.json
index 6118ae19..3b8669a8 100644
--- a/lang/vi.json
+++ b/lang/vi.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "Một tệp trong gói nén này không còn khả dụng. Hãy tải lại phần đã chọn.",
     "A scan is already running. Wait for it to finish.": "Đã có một lượt quét đang chạy. Hãy đợi nó hoàn tất.",
     "Something answered at :address, but it is not a ClamAV scanner.": "Có dịch vụ trả lời tại :address, nhưng đó không phải là trình quét ClamAV.",
-    "Available until :date": "Có sẵn đến :date"
+    "Available until :date": "Có sẵn đến :date",
+    "This file was not checked for viruses.": "Tệp này chưa được quét virus."
 }
diff --git a/lang/zh_CN.json b/lang/zh_CN.json
index 2c195a1b..bf6f61c9 100644
--- a/lang/zh_CN.json
+++ b/lang/zh_CN.json
@@ -2249,5 +2249,6 @@
     "A file in this archive is no longer available. Download the selection again.": "此压缩包中的某个文件已不可用。请重新下载所选内容。",
     "A scan is already running. Wait for it to finish.": "已有扫描正在进行。请等待其完成。",
     "Something answered at :address, but it is not a ClamAV scanner.": ":address 上有程序应答，但它不是 ClamAV 扫描器。",
-    "Available until :date": "可用至 :date"
+    "Available until :date": "可用至 :date",
+    "This file was not checked for viruses.": "此文件未经过病毒检查。"
 }
diff --git a/resources/js/components/files/unscanned-notice.tsx b/resources/js/components/files/unscanned-notice.tsx
new file mode 100644
index 00000000..d1dfe466
--- /dev/null
+++ b/resources/js/components/files/unscanned-notice.tsx
@@ -0,0 +1,38 @@
+import { ShieldQuestion } from 'lucide-react';
+
+import { useTranslation } from '@/hooks/use-translation';
+import { cn } from '@/lib/utils';
+
+interface UnscannedNoticeProps {
+    /** Whether this file went out without being checked. Decided by the server. */
+    unscanned?: boolean;
+    className?: string;
+}
+
+/**
+ * Told to whoever opens a public link: this file was never checked.
+ *
+ * It happens on an installation that scans and chose to let files through
+ * anyway — too large for the scanner, an archive it could not open, or an
+ * upload that arrived while the scanner was down. The uploader and the
+ * staff library both see that state on the file; the person following the
+ * link neither chose the policy nor can see the setting, and until this
+ * they were the only one with no signal at all.
+ *
+ * Stated plainly and without alarm: nothing is known to be wrong with the
+ * file. What is known is that nothing looked.
+ */
+export function UnscannedNotice({ unscanned, className }: UnscannedNoticeProps) {
+    const { t } = useTranslation();
+
+    if (!unscanned) {
+        return null;
+    }
+
+    return (
+        <p className={cn('text-muted-foreground flex items-center justify-center gap-1.5 text-xs', className)}>
+            <ShieldQuestion className="size-3.5 shrink-0" />
+            {t('This file was not checked for viruses.')}
+        </p>
+    );
+}
diff --git a/resources/js/pages/public/themes/compact/file.tsx b/resources/js/pages/public/themes/compact/file.tsx
index 4091e077..30d3b9a2 100644
--- a/resources/js/pages/public/themes/compact/file.tsx
+++ b/resources/js/pages/public/themes/compact/file.tsx
@@ -3,6 +3,7 @@ import { File as FileIcon } from 'lucide-react';
 
 import { CommentsShellCompact } from '@/components/comments/shells/comments-shell-compact';
 import { DownloadAction } from '@/components/download-action';
+import { UnscannedNotice } from '@/components/files/unscanned-notice';
 import { PreviewAction } from '@/components/preview-action';
 import { CategoryBadges, type CategoryTag } from '@/components/files/category-badges';
 import { type VersionLinks } from '@/components/files/version-badge';
@@ -33,6 +34,8 @@ interface PublicFileShowProps {
     preview_url: string | null;
     download_url: string;
     download_limit: DownloadLimit;
+    /** Whether the file went out unchecked — see UnscannedNotice. */
+    unscanned?: boolean;
     comments_enabled: boolean;
     comments_endpoint: string;
 }
@@ -43,6 +46,7 @@ export default function PublicFileShowCompact({
     preview_url,
     download_url,
     download_limit,
+    unscanned,
     comments_enabled,
     comments_endpoint,
 }: PublicFileShowProps) {
@@ -86,6 +90,8 @@ export default function PublicFileShowCompact({
                         />
                         <DownloadAction href={download_url} limit={download_limit} size="sm" />
                     </div>
+
+                    <UnscannedNotice unscanned={unscanned} className="justify-start" />
                 </div>
             </div>
 
diff --git a/resources/js/pages/public/themes/default/file.tsx b/resources/js/pages/public/themes/default/file.tsx
index d693cd6c..c177bdcc 100644
--- a/resources/js/pages/public/themes/default/file.tsx
+++ b/resources/js/pages/public/themes/default/file.tsx
@@ -3,6 +3,7 @@ import { File as FileIcon } from 'lucide-react';
 
 import { CommentsShellDefault } from '@/components/comments/shells/comments-shell-default';
 import { DownloadAction } from '@/components/download-action';
+import { UnscannedNotice } from '@/components/files/unscanned-notice';
 import { PreviewAction } from '@/components/preview-action';
 import { CategoryBadges, type CategoryTag } from '@/components/files/category-badges';
 import { type VersionLinks } from '@/components/files/version-badge';
@@ -33,6 +34,8 @@ interface PublicFileShowProps {
     preview_url: string | null;
     download_url: string;
     download_limit: DownloadLimit;
+    /** Whether the file went out unchecked — see UnscannedNotice. */
+    unscanned?: boolean;
     comments_enabled: boolean;
     comments_endpoint: string;
 }
@@ -43,6 +46,7 @@ export default function PublicFileShow({
     preview_url,
     download_url,
     download_limit,
+    unscanned,
     comments_enabled,
     comments_endpoint,
 }: PublicFileShowProps) {
@@ -81,6 +85,8 @@ export default function PublicFileShow({
                     <DownloadAction href={download_url} limit={download_limit} size="default" />
                 </div>
 
+                <UnscannedNotice unscanned={unscanned} />
+
                 {comments_enabled && (
                     <div className="w-full max-w-lg">
                         <CommentsShellDefault fileName={file.name} endpoint={comments_endpoint} inline />
diff --git a/resources/js/pages/public/themes/drive/file.tsx b/resources/js/pages/public/themes/drive/file.tsx
index 946aff06..7a250d88 100644
--- a/resources/js/pages/public/themes/drive/file.tsx
+++ b/resources/js/pages/public/themes/drive/file.tsx
@@ -2,6 +2,7 @@ import { Head } from '@inertiajs/react';
 
 import { CommentsShellDrive } from '@/components/comments/shells/comments-shell-drive';
 import { DownloadAction } from '@/components/download-action';
+import { UnscannedNotice } from '@/components/files/unscanned-notice';
 import { PreviewAction } from '@/components/preview-action';
 import { CategoryBadges, type CategoryTag } from '@/components/files/category-badges';
 import { type VersionLinks } from '@/components/files/version-badge';
@@ -33,6 +34,8 @@ interface PublicFileShowProps {
     preview_url: string | null;
     download_url: string;
     download_limit: DownloadLimit;
+    /** Whether the file went out unchecked — see UnscannedNotice. */
+    unscanned?: boolean;
     comments_enabled: boolean;
     comments_endpoint: string;
 }
@@ -43,6 +46,7 @@ export default function PublicFileShowDrive({
     preview_url,
     download_url,
     download_limit,
+    unscanned,
     comments_enabled,
     comments_endpoint,
 }: PublicFileShowProps) {
@@ -92,6 +96,8 @@ export default function PublicFileShowDrive({
                     />
                 </div>
 
+                <UnscannedNotice unscanned={unscanned} />
+
                 {comments_enabled && (
                     <div className="w-full">
                         <CommentsShellDrive fileName={file.name} endpoint={comments_endpoint} inline />
diff --git a/resources/js/pages/public/themes/gallery/file.tsx b/resources/js/pages/public/themes/gallery/file.tsx
index a2b7730e..9cfd78b4 100644
--- a/resources/js/pages/public/themes/gallery/file.tsx
+++ b/resources/js/pages/public/themes/gallery/file.tsx
@@ -3,6 +3,7 @@ import { File as FileIcon } from 'lucide-react';
 
 import { CommentsShellGallery } from '@/components/comments/shells/comments-shell-gallery';
 import { DownloadAction } from '@/components/download-action';
+import { UnscannedNotice } from '@/components/files/unscanned-notice';
 import { PreviewAction } from '@/components/preview-action';
 import { CategoryBadges, type CategoryTag } from '@/components/files/category-badges';
 import { type VersionLinks } from '@/components/files/version-badge';
@@ -33,6 +34,8 @@ interface PublicFileShowProps {
     preview_url: string | null;
     download_url: string;
     download_limit: DownloadLimit;
+    /** Whether the file went out unchecked — see UnscannedNotice. */
+    unscanned?: boolean;
     comments_enabled: boolean;
     comments_endpoint: string;
 }
@@ -43,6 +46,7 @@ export default function PublicFileShowGallery({
     preview_url,
     download_url,
     download_limit,
+    unscanned,
     comments_enabled,
     comments_endpoint,
 }: PublicFileShowProps) {
@@ -84,6 +88,8 @@ export default function PublicFileShowGallery({
                     <DownloadAction href={download_url} limit={download_limit} size="lg" />
                 </div>
 
+                <UnscannedNotice unscanned={unscanned} />
+
                 {comments_enabled && (
                     <div className="w-full">
                         <CommentsShellGallery fileName={file.name} endpoint={comments_endpoint} inline />
diff --git a/resources/js/pages/share/show.tsx b/resources/js/pages/share/show.tsx
index c64f2e36..8ab556fa 100644
--- a/resources/js/pages/share/show.tsx
+++ b/resources/js/pages/share/show.tsx
@@ -2,6 +2,7 @@ import { Head } from '@inertiajs/react';
 import { Download } from 'lucide-react';
 
 import { CategoryBadges, type CategoryTag } from '@/components/files/category-badges';
+import { UnscannedNotice } from '@/components/files/unscanned-notice';
 import { Button } from '@/components/ui/button';
 import { useTranslation } from '@/hooks/use-translation';
 import AuthLayout from '@/layouts/auth-layout';
@@ -15,9 +16,11 @@ interface ShareShowProps {
         categories: CategoryTag[];
     };
     download_url?: string;
+    /** Whether the file went out unchecked — see UnscannedNotice. */
+    unscanned?: boolean;
 }
 
-export default function ShareShow({ status, file, download_url }: ShareShowProps) {
+export default function ShareShow({ status, file, download_url, unscanned }: ShareShowProps) {
     const { t } = useTranslation();
 
     if (status !== 'active' || !file || !download_url) {
@@ -56,6 +59,8 @@ export default function ShareShow({ status, file, download_url }: ShareShowProps
                     <Download className="size-4" /> {t('Download')}
                 </a>
             </Button>
+
+            <UnscannedNotice unscanned={unscanned} className="mt-4" />
         </AuthLayout>
     );
 }
diff --git a/tests/Feature/Files/UnscannedNoticeTest.php b/tests/Feature/Files/UnscannedNoticeTest.php
new file mode 100644
index 00000000..6d2d7b02
--- /dev/null
+++ b/tests/Feature/Files/UnscannedNoticeTest.php
@@ -0,0 +1,109 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Models\User;
+use App\Modules\Files\Models\File;
+use App\Modules\Files\Scanning\NotScannedReason;
+use App\Modules\Files\Scanning\ScanStatus;
+use App\Modules\Files\Sharing\CreateShareLink;
+use App\Modules\Groups\Models\Group;
+use App\Modules\Platform\Settings\Setting;
+use App\Modules\Platform\Settings\Settings;
+use Illuminate\Support\Facades\Storage;
+use Inertia\Testing\AssertableInertia;
+
+/**
+ * What somebody following a public link is told about a file nothing
+ * checked.
+ *
+ * An installation that scans can still let files through — too large for
+ * the scanner, an archive it could not open, or an upload that arrived
+ * while the scanner was down. The uploader sees that on their own file and
+ * staff see it in the library. The person holding the link sees the same
+ * page as for a file that passed, and they neither chose the policy nor
+ * can see the setting.
+ */
+beforeEach(function () {
+    Storage::fake('files');
+    $this->admin = User::factory()->create();
+    $this->settings = app(Settings::class);
+
+    $this->settings->set(Setting::VirusScanningEnabled, true);
+    $this->settings->set(Setting::VirusScannerAddress, 'tcp://scanner.test:3310');
+    $this->settings->set(Setting::PublicListingEnabled, true);
+    $this->settings->set(Setting::PublicListingSlug, 'public');
+    $this->settings->set(Setting::Theme, 'default');
+});
+
+/** The `unscanned` prop on the share page for a file in this state. */
+function sharedFileNotice(array $scan): bool
+{
+    $file = File::factory()->create(array_merge(['uploaded_by' => test()->admin->id], $scan));
+    $link = app(CreateShareLink::class)->for($file, test()->admin);
+
+    $notice = null;
+
+    test()->get("/s/{$link->token}")->assertInertia(function (AssertableInertia $page) use (&$notice) {
+        $notice = $page->toArray()['props']['unscanned'];
+    });
+
+    return $notice;
+}
+
+test('a link to a file nothing checked says so', function () {
+    expect(sharedFileNotice([
+        'scan_status' => ScanStatus::NotScanned,
+        'scan_note' => NotScannedReason::TooLarge->value,
+    ]))->toBeTrue();
+});
+
+test('the same for a file that went out while the scanner was down, or that it could not open', function () {
+    foreach ([NotScannedReason::ScannerUnavailable, NotScannedReason::Encrypted] as $reason) {
+        expect(sharedFileNotice(['scan_status' => ScanStatus::NotScanned, 'scan_note' => $reason->value]))
+            ->toBeTrue($reason->value);
+    }
+});
+
+test('a file that passed says nothing', function () {
+    expect(sharedFileNotice(['scan_status' => ScanStatus::Clean]))->toBeFalse();
+});
+
+test('a file from before this installation scanned says nothing', function () {
+    // Every file on an installation that has only just switched scanning
+    // on is in this state. Saying it about all of them says nothing about
+    // any of them.
+    expect(sharedFileNotice([
+        'scan_status' => ScanStatus::NotScanned,
+        'scan_note' => NotScannedReason::BeforeScanning->value,
+    ]))->toBeFalse();
+
+    expect(sharedFileNotice(['scan_status' => ScanStatus::NotScanned, 'scan_note' => null]))->toBeFalse();
+});
+
+test('an installation that does not scan says nothing about any of it', function () {
+    $this->settings->set(Setting::VirusScanningEnabled, false);
+
+    expect(sharedFileNotice([
+        'scan_status' => ScanStatus::NotScanned,
+        'scan_note' => NotScannedReason::TooLarge->value,
+    ]))->toBeFalse();
+});
+
+test('the public file page says it too, in every theme', function (string $theme) {
+    $this->settings->set(Setting::Theme, $theme);
+
+    $group = Group::query()->create(['name' => 'Showcase', 'public' => true]);
+    $file = File::factory()->public()->create([
+        'uploaded_by' => $this->admin->id,
+        'scan_status' => ScanStatus::NotScanned,
+        'scan_note' => NotScannedReason::ScannerUnavailable->value,
+    ]);
+    shareFileWithGroup($file, $group);
+
+    $this->get("/public/files/{$file->slug}")->assertInertia(
+        fn (AssertableInertia $page) => $page
+            ->component("public/themes/{$theme}/file")
+            ->where('unscanned', true),
+    );
+})->with(['default', 'compact', 'drive', 'gallery']);