Skip to content
OpenAdvisories
High · 7.4 Public exploit CVE-2026-73311 EUVD-2026-72782GHSA-mrq5-6m75-wpj5

XenForo < 2.3.13 OAuth2 Authorization Code Reuse

Published Sep 8, 2026 · Updated Oct 1, 2026 · Assigned by VulnCheck

Vendor: XenForo Product: XenForo

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

VendorProductAffectedFixed
XenForo XenForo < 2.3.13 2.3.13

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References