CVE-2026-73312 XenForo < 2.3.13 Refresh Token Replay via Expired Access Token
Attackers can replay refresh tokens to maintain persistent unauthorized access by exploiting a failure to invalidate tokens after parent access token expiration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73312?
CVE-2026-73312 is a critical authentication bypass vulnerability in XenForo, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-294
Which versions are affected by CVE-2026-73312?
It affects 1 product.
Products include Xenforo Xenforo.
How do I fix CVE-2026-73312?
No fix has been published for CVE-2026-73312 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-73312 being exploited?
There is no known exploitation of CVE-2026-73312 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in XenForo
Sources
Also known as GHSA-5x52-2mc2-4jqr.