CVE-2026-74239 XenForo < 2.3.13 Path Traversal via Style Archive Importer on Windows

What is CVE-2026-74239?

CVE-2026-74239 is a high-severity path traversal vulnerability in XenForo, published on 8 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

XenForo before 2.3.13 contains a path traversal vulnerability in the style archive importer on Windows deployments that allows authenticated non-super administrators with style permissions to write arbitrary files outside the intended extraction directory by using backslash-based traversal sequences in ZIP member names. Attackers can craft a malicious ZIP archive with backslash path separators that bypass forward-slash validation to write arbitrary bytes to any web-server-writable path, including the public web root, achieving persistent code execution as the web-server account.

Weakness: CWE-22

Which versions are affected by CVE-2026-74239?

It affects 1 product.

Products include Xenforo Xenforo.

How do I fix CVE-2026-74239?

No fix has been published for CVE-2026-74239 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-74239 being exploited?

There is no known exploitation of CVE-2026-74239 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in XenForo

• CVE-2025-71279 XenForo Passkey Security Bypass Critical 9.3
• CVE-2026-73309 XenForo < 2.3.13 Authentication Bypass via OAuth2 Token Endpoint Critical 9.1
• CVE-2026-73311 XenForo < 2.3.13 OAuth2 Authorization Code Reuse Critical 9.1
• CVE-2026-73312 XenForo < 2.3.13 Refresh Token Replay via Expired Access Token Critical 9.1
• CVE-2024-38457 Xenforo before 2.2.16 allows CSRF. High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-fxw8-p3x8-7xqx.