W3 Total Cache, CVE-2026-18051

CVE, Research URL: CVE-2026-18051
Home page URL: Security reports for W3 Total Cache
Application: W3 Total Cache
Published on: Aug 19, 2026
Research Description: The W3 Total Cache WordPress plugin before 2.10.5 does not properly validate the request path it uses 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.
Affected versions: max 2.10.5.
Status: vulnerable