The Perfmatters plugin for WordPress is vulnerable to arbitrary file deletion via path traversal in all versions up to, and including, 2.5.9.1. This is due to the `PMCS::action_handler()` method processing the `$_GET['delete']` parameter without any sanitization, authorization check, or nonce verification. The unsanitized filename is concatenated with the storage directory path and passed to `unlink()`. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the server by using `../` path traversal sequences, including `wp-config.php` which would force WordPress into the installation wizard and allow full site takeover.
| Software Type | Plugin |
|---|---|
| Software Slug |
perfmatters
View on wordpress.org
|
| CVE | CVE-2026-4350 |
| Patched Versions |
2.6.0
|
| Affected Versions |
*-2.5.9.1
|
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