Information Exposure Vulnerability in W3 Total Cache Plugin for WordPress

CVE-2026-5032

What is CVE-2026-5032?

The W3 Total Cache plugin for WordPress allows unauthenticated attackers to reveal sensitive information due to a flaw in how it processes User-Agent headers. Specifically, if the User-Agent header contains 'W3 Total Cache', the plugin bypasses its output buffering mechanism and exposes raw dynamic fragment HTML comments, including the security token W3TC_DYNAMIC_SECURITY, in the page source. This vulnerability could potentially allow attackers to exploit fragment caching features if developer-placed dynamic tags are present, leading to unauthorized data discovery.

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References