EUVD-2026-21262CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Lifecycle Timeline
3Description
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`.
Analysis
Authenticated arbitrary file overwrite in Perfmatters WordPress plugin ≤2.5.9 allows low-privileged attackers (Subscriber-level and above) to corrupt critical server files via path traversal. The PMCS::action_handler() method processes bulk activate/deactivate actions without authorization checks or nonce verification, passing unsanitized $_GET['snippets'][] values through Snippet::activate()/deactivate() to file_put_contents(). …
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Remediation
Within 24 hours: Inventory all WordPress installations using Perfmatters plugin and document current versions; disable the plugin on all affected instances. Within 7 days: Contact Perfmatters vendor for patch timeline and interim guidance; implement file integrity monitoring on critical server files (.htaccess, index.php, wp-config.php). …
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External POC / Exploit Code
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