CVE-2026-74239CWE-22path-traversal

CVE-2026-74239

High · published September 8, 2026

CVSS v3.1
7.2
EPSS
1%
Percentile
58.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
8.6 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00887 · 58.9th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-09-08T18:17Z
Affected products (1)
ProductVersionsFixed in
xenforo/xenforo< 2.3.132.3.13
References (5)
https://bombobombone.github.io/posts/cve-2026-74239/ · [email protected]https://github.com/BomboBombone/CVE-2026-74239 · [email protected]https://www.vulncheck.com/advisories/xenforo-path-traversal-via-style-archive-importer-on-windows · [email protected]https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/ · [email protected]https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/ · [email protected]
EPSS history
Timeline
  • 10 SEP 03:18Z
    EPSS moved — → 1%
    epss
  • 08 SEP 13:20Z
    XenForo < 2.3.13 Path Traversal via Style Archive Importer on Windows
    cvelistv5