---
id: CVE-2026-74239
title: >-
  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 ex…
summary: >-
  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 ex…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-22
vendor: xenforo
product: xenforo
affected:
  - xenforo < 2.3.13
patched:
  - xenforo 2.3.13
published: '2026-09-08'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T20:30:32.290'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74239'
references:
  - url: 'https://bombobombone.github.io/posts/cve-2026-74239/'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/BomboBombone/CVE-2026-74239'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/xenforo-path-traversal-via-style-archive-importer-on-windows
    label: disclosure@vulncheck.com
  - url: >-
      https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/
    label: disclosure@vulncheck.com
  - url: >-
      https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/
    label: disclosure@vulncheck.com
tags:
  - nvd
  - exploit-available
  - cve.org
epss: 0.00695
epssPercentile: 0.51549
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/BomboBombone/CVE-2026-74239'
  checkedAt: '2026-09-23T07:14:46.990Z'
exploitAvailable: true
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-08T14:00:52.670163Z'
ingestedAt: '2026-09-08T15:33:26.985Z'
---

## Overview

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

- `xenforo < 2.3.13`

## Remediation

Upgrade past the affected range:

- `xenforo 2.3.13`