CVE-2026-73312

XenForo before 2.3.13 contains a refresh token replay vulnerability that allows attackers to reuse a refresh token multiple times by exploiting the failure to mark tokens as consumed when the parent access token has expired. Attackers can repeatedly submit the same refresh token to generate additional independent token pairs, achieving persistent unauthorized access for the token's full lifetime.

• CWE-294

• https://bombobombone.github.io/posts/cve-2026-73312/Exploit, Third Party Advisory
• https://github.com/BomboBombone/CVE-2026-73312Exploit, Third Party Advisory
• https://www.vulncheck.com/advisories/xenforo-refresh-token-replay-via-expired-access-tokenThird Party Advisory
• https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/Release Notes
• https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/Release Notes

Published

Sep 8, 2026

Last Modified

Sep 11, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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