CVE-2026-4351

Summary

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.

Affected Software

Weaknesses

• CWE-22: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://www.wordfence.com/threat-intel/vulnerabilities/id/c172ab2b-ce1f-4a0d-b31f-b75ff2f03506?source=cve
• https://perfmatters.io/docs/changelog/

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