Highlights
Authorization Bypass: 3 prior fixes. Scrutinize any change in this area.
synapse/federation/federation_server.py: most-fixed (3 issues). Treat as high-risk during review.
8 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.
Authorization Bypass: 2 historical fix(es) link synapse/federation/federation_server.py, synapse/handlers/device.py, synapse/handlers/e2e_keys.py to Authorization Bypass.
Authentication Bypass: 1 historical fix(es) link synapse/api/auth.py, synapse/handlers/register.py to Authentication Bypass.
Authorization Bypass: 1 historical fix(es) link synapse/groups/groups_server.py to Authorization Bypass.