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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
XenForo XenForo
Default version status: unaffected
0 to < 2.3.13affected
References
- https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/ ↗
- https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/ ↗
- https://bombobombone.github.io/posts/cve-2026-73311/ ↗
- https://github.com/BomboBombone/CVE-2026-73311 ↗
- https://www.vulncheck.com/advisories/xenforo-oauth2-authorization-code-reuse ↗