Highlights
Authentication Bypass: 2 prior fixes. Scrutinize any change in this area.
lib/omniauth/strategies/facebook.rb: most-fixed (8 issues). Treat as high-risk during review.
5 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.
Authentication Bypass: Accepting user-controlled request parameters to construct access tokens bypasses the standard OAuth verification flow, permitting arbitrary identity assertion.
Cross-Site Request Forgery: Allowing incoming request parameters to override the internally generated 'state' variable directly weakens the CSRF protections built into the OAuth protocol.
Denial of Service: Unhandled exceptions during callback execution and nil-pointer crashes in signature decoding allow attackers to crash the request thread or application process.