High severity7.4NVD Advisory· Published Sep 8, 2026· Updated Sep 11, 2026
CVE-2026-73311
CVE-2026-73311
Description
XenForo before 2.3.13 contains an OAuth2 authorization code reuse vulnerability that allows attackers to obtain unauthorized token pairs by submitting a previously used authorization code. Attackers can exploit the failure to invalidate or mark authorization codes as consumed after initial token issuance to receive an independent token pair for the same user and scopes, bypassing the single-use guarantee of the OAuth2 authorization code flow.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2Patches
Vulnerability mechanics
References
4- bombobombone.github.io/posts/cve-2026-73311/nvdExploitThird Party Advisory
- www.vulncheck.com/advisories/xenforo-oauth2-authorization-code-reusenvdThird Party Advisory
- xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/nvdRelease Notes
- xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/nvdRelease Notes
News mentions
0No linked articles in our index yet.