Highlights
SSRF: 1 prior fix. Scrutinize any change in this area.
src-backend/app.py: most-fixed (1 issue). Treat as high-risk during review.
2 high-severity fixes in this history; regressions here are high-impact.
Recurring patterns
The bug types that recur here, drawn from past fixes, not open vulnerabilities.
Stored XSS: Untrusted markdown is rendered via markdown-it; without sanitization, stored messages can execute script in other users' browsers.
SSRF: The CORS proxy forwards arbitrary URLs via aiohttp session.request; without an allowlist, attackers can reach internal services.