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.
Metrics
CVSS 3.1 7.2/10
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| XenForo | XenForo | < 2.3.13 |
References
- https://bombobombone.github.io/posts/cve-2026-74239/Exploit, Third Party Advisory
- https://github.com/BomboBombone/CVE-2026-74239Exploit, Third Party Advisory
- https://www.vulncheck.com/advisories/xenforo-path-traversal-via-style-archive-importer-on-windowsThird Party Advisory
- https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/Release Notes
- https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/Release Notes
Timeline
- Published
- Sep 8, 2026
- Last modified
- Sep 11, 2026
- NVD status
- Analyzed