Vulnerability record · CVE-2026-73312 · published 8 September 2026

CVE-2026-73312: Xenforo authentication bypass by capture-replay vulnerability

Xenforo · Xenforo

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.

9.1 CVSS 4.0 Critical EPSS 0.47% · top 61.5% CWE-294 · Authentication bypass by capture-replay

9.1CVSS 4.0 base score

0.47%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

5References, 2 tagged exploit

11 Sep 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Xenforo Xenforo

References

Link	Tags
https://bombobombone.github.io/posts/cve-2026-73312/	ExploitThird Party Advisory
https://github.com/BomboBombone/CVE-2026-73312	ExploitThird Party Advisory
https://www.vulncheck.com/advisories/xenforo-refresh-token-replay-via-expired-access-token	Third Party Advisory
https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.23	Release Notes
https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/	Release Notes

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-73312), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.