W3 Total Cache, CVE-2026-87920

CVE, Research URL: CVE-2026-87920
Home page URL: Security reports for W3 Total Cache
Application: W3 Total Cache
Published on: Oct 02, 2026
Research Description: The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content via Output-Buffer Regex Rewrite in all versions up to, and including, 2.10.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability is only exploitable when the 'Remove query strings from static resources' option is enabled in W3 Total Cache, as mutate_url() must strip the '?' delimiter and everything following it — including the closing quote of the outer attribute — to break the attribute boundary.
Affected versions: max 2.10.7.
Status: vulnerable