CVE-2026-87920W3 Total Cache <= 2.10.6 - Unauthenticated Stored Cross-Site Scripting via Comment Content
Updated under an hour ago ()
Does this affect you?
It affects boldgrid W3 Total Cache. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.24%, higher than 14% of scored CVEs.
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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.
- CVSS
- 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.24% (percentile 14)
- Assigned by
- Wordfence
- NVD analysis
- Deferred
- Record last updated
- Oct 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
boldgrid W3 Total Cache boldgrid:w3_total_cache (from the name) | through 2.10.6 | CNA record |
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/34bd7c32-f4c5-4015-909a-e4730f35494b?source=cve
- https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.6/BrowserCache_Plugin.php#L259
- https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.6/BrowserCache_Plugin.php#L208
- https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.10.6/BrowserCache_Plugin.php#L336
- https://plugins.trac.wordpress.org/changeset?reponame=&new=3723494%40w3-total-cache%2Ftags%2F2.10.7&old=3681561%40w3-total-cache%2Ftags%2F2.10.6
- https://plugins.trac.wordpress.org/changeset/3723494/w3-total-cache/trunk/BrowserCache_Plugin.php
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.