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VULNERABILITIES

CVE-2026-73311 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.4 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bombobombone.github.io/posts/cve-2026-73311/ [email protected]ExploitThird Party Advisory
https://github.com/BomboBombone/CVE-2026-73311 [email protected]ExploitThird Party Advisory
https://www.vulncheck.com/advisories/xenforo-oauth2-authorization-code-reuse [email protected]Third Party Advisory
https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/ [email protected]Release Notes
https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/ [email protected]Release Notes

Weakness Enumeration

CWE-IDCWE NameSource
CWE-294Authentication Bypass by Capture-replay[email protected]

Affected Products

ProductVersions
xenforo xenforo
< 2.3.13

CPE

  • cpe:2.3:a:xenforo:xenforo:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-73311
NVD Published Date:
Sep 8, 2026
NVD Last Modified:
Sep 11, 2026
Source:
[email protected]
CVE-2026-73311 Details - Not Deferred