CVE-2026-66695

W3 Total Cache versions up to 2.9.1 contain a broken access control vulnerability, potentially allowing unauthorized access to resources.

The W3 Total Cache WordPress plugin before 2.10.5 does not properly validate the request path used to build cache file names, allowing unauthenticated attackers to write a file into any existing directory on the server, inside or outside the web root, overwriting whatever occupies the target name. On Apache, the same flaw overwrites the site's .htaccess files, which breaks the site and can strip hardening rules that other security measures rely on.

The W3 Total Cache plugin versions up to 2.9.4 contain a critical vulnerability allowing unauthenticated remote arbitrary code execution. The flaw stems from insufficient input validation in the caching mechanism.

The W3 Total Cache plugin for WordPress up to version 2.10.3 is vulnerable to Stored Cross-Site Scripting via Comment Author Name due to insufficient input sanitization and output escaping. The vulnerability is only exploitable when the Lazy Load Images feature is enabled, as the unsafe re-emission occurs exclusively within the LazyLoad mutator's img tag rewriting step.

The W3 Total Cache plugin for WordPress up to version 2.9.4 is vulnerable to Directory Traversal via the setupSources function. Unauthenticated attackers can read arbitrary files on the server, potentially exposing sensitive information. Exploitation requires enabling manual minify mode and providing a specific minify filename.