CVE-2026-73310
XenForo before 2.3.13 contains an authorization flaw in the OAuth2 token endpoint that allows attackers controlling any allowlisted redirect URI to bypass redirect URI binding by submitting a different allowlisted URI than the one recorded at authorization time. Attackers can exchange an intercepted authorization code using a mismatched redirect URI to steal OAuth2 tokens from intercepted authorization flows.
- Published Sep 8, 2026
- CVSS 8.2 high
- 0.5% chance of exploitation in the next 30 days (EPSS)
- Public exploit code is available
- A fix is available