Is CVE-2026-74239 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-74239?

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

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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.