The query recognizes only npm limiter packages, never oauthRateLimit /
oauthTokenRateLimit, and flags a handler as soon as it calls a function
named like *auth*, *login* or *verify*. All six alerts it ever raised were
on throttled OAuth routes (the last two came from tenantAuthority()).
What it stood in for is now a test: every route of the OAuth router must
run a per-IP limiter first unless it is one of the three named discovery
documents, /oauth/token must carry the strict budget, and a router.use()
middleware fails the check. Verified by mutation: removing the limiter
from /oauth/authorize fails the test with the route name.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Bucket B (real fixes) + Bucket A (config) of the CodeQL alert triage.
Log-forging (cs/log-forging, 8 sinks): add Helpers/LogSanitizer that strips
CR/LF and other control characters, and apply it to the logged copy of every
user-controlled value in AuthenticationMiddleware, PolicyEnforcementMiddleware
(Invoke + DecideAsync), McpQuotaEnforcementMiddleware and TableUserUsageRepository.
Only the logged value is sanitized — routing, authorization and storage keys are
untouched, so tracing fidelity for legitimate values (paths, UPNs, GUIDs) is
preserved. Structured logging already isolated the fields; this closes the CRLF
vector as defense-in-depth and clears the query.
Three genuine JS/TS fixes:
- guardValidation.ts: replace the no-op `.replace(/%/g, "%")` with a real
escapeRegExp() — the author intended to escape; this also closes the latent
metacharacter gap (js/identity-replacement).
- access-guard.ts: use a `%s` format argument instead of interpolating the UPN
into the console.error format string (js/tainted-format-string).
- docs-corpus.ts: strip HTML tags with a loop-until-stable stripHtmlTags() so the
sanitizer is robust and recognized as complete (js/incomplete-multi-char-sanitization).
CodeQL config: filter the two queries that fire structurally on this codebase,
where the flagged behavior is the feature — cs/exposure-of-sensitive-information
(audit/notification logs legitimately record the actor UPN / recipient email) and
cs/cleartext-storage-of-sensitive-information (rate limiters key on the trusted
client IP). Default suites stay active; genuine one-off false positives from other
queries are dismissed individually so those queries stay sharp.
Tests: Backend xUnit 3110 (+9 LogSanitizer), MCP vitest 19 (+1 tag-strip),
Web vitest 49, all tsc clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Oliver Kieselbach