XSS in Boldgrid W3 Total Cache
CVE-2026-120019
The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 2.10.7 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 HTML Minify to be enabled with the default 'mfunc' entry present in the ignored-comment stems list, and exploitation depends on the attacker predicting the md5(time()) placeholder namespace by reading the server clock via the HTTP Date response header within the applicable time window.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/3a14a537-64e7-415b-be8e-a3a93…
- plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.7/Minify_Plugin.php
- plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.7/lib/Minify/Minify…
- plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.7/lib/Minify/Minify…
- github.com/BoldGrid/w3-total-cache/commit/35c6896332aff6b41888db0595cf09b4c98c8…
- plugins.trac.wordpress.org/changeset/3757452/w3-total-cache/trunk/lib/Minify/Mi…
Frequently asked questions
- What is CVE-2026-120019?
- CVE-2026-120019 is a medium-severity vulnerability in Boldgrid W3 Total Cache, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-31.
- How severe is CVE-2026-120019?
- Medium severity. CVSS v3 base score is 5.4 out of 10.