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HIGH

CVE-2026-74239

CVSS v3

7.2

HIGH

EPSS Score

0.9 %

exploit probability, as of 2026-09-28

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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, includin

Technical details

Published
2026-09-08
Last Modified
2026-09-09

Frequently asked questions

What is CVE-2026-74239?

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, includin

Is CVE-2026-74239 actively exploited?

Active exploitation of CVE-2026-74239 has not been confirmed. Its EPSS score was 0.9% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-74239?

CVE-2026-74239 has a CVSS v3 base score of 7.2 (HIGH severity).

Is CVE-2026-74239 affecting your environment?

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