Description
The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content via LazyLoad Background Mutator in all versions up to, and including, 2.10.5 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 requires the "Lazy Load Images" feature with "Process background images" to be enabled, and the malicious comment to be approved by a moderator before execution is triggered.
References8
- plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.5/U…
- plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.5/U…
- plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.5/U…
- plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.5/U…
- plugins.trac.wordpress.org/changeset/3680101/w3-total-cache/tag…
- plugins.trac.wordpress.org/changeset?old_path=%2Fw3-total-cache…
- plugins.trac.wordpress.org/changeset?reponame=&new=3680101%40w3…
- www.wordfence.com/threat-intel/vulnerabilities/id/5580ad05-af50…
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: 43 · as of 7 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.