docs(security): CSRF/CSWSH coverage audit + per-adapter guidance (A4, #21)#36
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…21) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JpsdVdokfe732D9aQKTXXQ
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Summary
Completes the A4 CSRF audit deliverable from Epic A (#21) as a docs-only change:
docs/SECURITY_CSRF.md(new) — canonical CSRF & Cross-Site WebSocket Hijacking guide: threat model (ambient-credential framing, form-encoded body vector), per-adapter coverage table (Django enforces viaCsrfViewMiddleware; FastAPI/Litestar/Flask have zero enforcement), CSWSH exposure of all four WS handlers, documentation reality-check, and a prioritized list of follow-up work (issues to be opened separately).CLAUDE.md— reworded the aspirational "CSRF protection required for mutations" bullet to reflect reality: enforced automatically only on the Django adapter; other adapters require host-level integration, pointing at the new doc.README.md— added a docs-table row linking the new guide.No code changes; no behavior changes.
Test plan
docs/SECURITY_CSRF.mdresolves from README/CLAUDE.md at repo rootRefs #21 (A4 audit deliverable — audit report landed as documentation; follow-up issues from §5 to be opened separately).
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https://claude.ai/code/session_01JpsdVdokfe732D9aQKTXXQ