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Medium · 5.9 Public exploit CVE-2026-73310 EUVD-2026-72781GHSA-3hj9-69jw-9xx6

XenForo < 2.3.13 OAuth2 Authorization Code Token Theft via redirect_uri Bypass

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

Vendor: XenForo Product: XenForo

Description

XenForo before 2.3.13 contains an authorization flaw in the OAuth2 token endpoint that allows attackers controlling any allowlisted redirect URI to bypass redirect URI binding by submitting a different allowlisted URI than the one recorded at authorization time. Attackers can exchange an intercepted authorization code using a mismatched redirect URI to steal OAuth2 tokens from intercepted authorization flows.

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