# CVE-2026-73310

## Summary

- **CVE ID:** CVE-2026-73310
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-863
- **Published:** Sep 8, 2026
- **Last Modified:** Sep 9, 2026

## Description

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.

## Affected Products

- XenForo — XenForo (0)

## References

- [CNA](https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/)
- [CNA](https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/)
- [CNA](https://www.vulncheck.com/advisories/xenforo-oauth2-authorization-code-token-theft-via-redirect-uri-bypass)
- [CNA](https://bombobombone.github.io/posts/cve-2026-73310/)
- [CNA](https://github.com/BomboBombone/CVE-2026-73310)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 29.0

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._