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CVE-2026-73312

CriticalPublished

XenForo < 2.3.13 Refresh Token Replay via Expired Access Token

Published: Sep 8, 2026
Updated: Sep 9, 2026
Assigning CNA: VulnCheck
Evidence observed: Sep 8, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 4.0

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:X/V:X/RE:X/U:X

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 28.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-73312PoC
Proof-of-concept and technical write-up for CVE-2026-73312, an OAuth2 refresh token replay vulnerability in XenForo before 2.3.13. Includes a Python script to test for the issue.

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