WordPress Perfmatters plugin <= 2.5.9 - Authenticated (Subscriber+) Arbitrary File Overwrite via 'snippets' Parameter vulnerability

Authenticated Subscriber+ Arbitrary File Overwrite via 'snippets' Parameter vulnerability discovered by hoshino in WordPress Plugin Perfmatters versions = 2.5.9...

CVE-2026-4351

CVE-2026-4351 concerns the Perfmatters WordPress plugin (≤ 2.5.9). The issue arises from PMCS::action_handler() handling bulk activate/deactivate actions without proper authorization or nonce verification. User-supplied $_GET['snippets'][] values are passed unsanitized to Snippet::activate()/Snip...