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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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.
GitHub 1 repository
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BomboBombone/CVE-2026-74239 ★ 0 · Sep 8, 2026
Sanitized XenForo write-up and proof of concept for CVE-2026-74239.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- Vendor Advisory vendor-advisory patch
- Release Notes release-notes
- Researcher Advisory technical-description
- Researcher PoC exploit
- https://www.vulncheck.com/advisories/xenforo-path-traversal-via-style-archive-importer-on-windows third-party-advisory