High severity7.2NVD Advisory· Published Sep 8, 2026· Updated Sep 11, 2026
CVE-2026-74239
CVE-2026-74239
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.
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Affected products
2Patches
Vulnerability mechanics
References
4- bombobombone.github.io/posts/cve-2026-74239/nvdExploitThird Party Advisory
- www.vulncheck.com/advisories/xenforo-path-traversal-via-style-archive-importer-on-windowsnvdThird Party Advisory
- xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/nvdRelease Notes
- xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/nvdRelease Notes
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