PT-2026-31849 · Perfmatters · Perfmatters

Published 2026-04-10 · Updated 2026-04-10 · CVE-2026-4351

NVD

CVSS v3.1

8.1

High

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

The Perfmatters plugin for WordPress is vulnerable to arbitrary file overwrite via path traversal in all versions up to, and including, 2.5.9. This is due to the PMCS::action handler() method processing the bulk action activate/deactivate handlers without any authorization check or nonce verification. The $ GET['snippets'][] values are passed unsanitized to Snippet::activate()/Snippet::deactivate() which call Snippet::update() then file put contents() with the traversed path. This makes it possible for authenticated attackers, with Subscriber-level access and above, to overwrite arbitrary files on the server with a fixed PHP docblock content, potentially causing denial of service by corrupting critical files like .htaccess or index.php.

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-4351

Affected Products

Perfmatters

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-4351 · Security Note
• https://perfmatters.io/docs/changelog · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/c172ab2b-ce1f-4a0d-b31f-b75ff2f03506?source=cve · Note