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.
References6
- plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.6/B…
- plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.6/B…
- plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.6/B…
- plugins.trac.wordpress.org/changeset/3723494/w3-total-cache/tru…
- plugins.trac.wordpress.org/changeset?reponame=&new=3723494%40w3…
- www.wordfence.com/threat-intel/vulnerabilities/id/34bd7c32-f4c5…
Metrics
- CVSS 3.1
-
7.2
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 15 · as of 10 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.