PT-2026-29431 · Xenforo · Xenforo

Published 2026-04-01 · Updated 2026-04-01 · CVE-2026-35056

Positive Technologies (AI Summary)

CVSS v3.1

7.2

High

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions XenForo versions prior to 2.3.9 and prior to 2.2.18

Description XenForo allows remote code execution (RCE) by authenticated, but malicious, admin users. An attacker with admin panel access can execute arbitrary code on the server.

Recommendations Update to XenForo version 2.3.9 or later. Update to XenForo version 2.2.18 or later.

Fix

RCE

Code Injection

Weakness Enumeration

CWE-94

Related Identifiers

CVE-2026-35056

Affected Products

Xenforo

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-35056 · Security Note
• https://twitter.com/TheHackerWire/status/2039160873235923380 · Twitter Post
• https://twitter.com/CVEnew/status/2039279698765922814 · Twitter Post
• https://twitter.com/CveFindCom/status/2039156574975877557 · Twitter Post
• https://vulncheck.com/advisories/xenforo-remote-code-execution-via-authenticated-admin · Note
• https://twitter.com/CVEarity/status/2039279377826152944 · Twitter Post
• https://xenforo.com/community/threads/xenforo-2-3-9-inc-xfmg-2-2-18-released-security-fix.235659 · Vendor Advisory, Patch