PT-2026-29900 · WordPress · Perfmatters

Published 2026-04-02 · Updated 2026-04-10 · CVE-2026-4350

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Perfmatters plugin for WordPress versions through 2.5.9.1

Description The Perfmatters plugin for WordPress contains a flaw that allows for arbitrary file deletion through path traversal. The PMCS::action handler() method processes the $ GET['delete'] parameter without proper sanitization, authorization checks, or nonce verification. This allows attackers to use ../ sequences to delete arbitrary files on the server, including wp-config.php. Deleting wp-config.php can lead to full site takeover. More than 200,000 WordPress sites were potentially affected.

Recommendations Update to version 2.6.0 or later.

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-4350

Affected Products

Perfmatters

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-4350 · Security Note
• https://perfmatters.io/docs/changelog · Note
• https://twitter.com/TheHackerWire/status/2039991227840594379 · Twitter Post
• https://twitter.com/StrongKeepCyber/status/2040278343463972930 · Twitter Post
• https://twitter.com/DFIR_Radar/status/2039931571978097067 · Twitter Post
• https://i.redd.it/bksd8f1k2usg1.png · Reddit Post
• https://twitter.com/CVEnew/status/2040128716479553682 · Twitter Post
• https://wordfence.com/threat-intel/vulnerabilities/id/58b9dab8-8539-4b53-b08d-f6ee3e1e744c?source=cve · Note
• https://twitter.com/Argus_pd/status/2042622270225682675 · Twitter Post