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Vulnerability record · CVE-2026-5032 · published 2 April 2026

CVE-2026-5032: Information exposure vulnerability

The W3 Total Cache plugin for WordPress is vulnerable to information exposure in all versions up to, and including, 2.9.3. This is due to the plugin bypassing its entire output buffering and processing pipeline when the request's User-Agent header contains "W3 Total Cache", which causes raw mfunc/mclude dynamic fragment HTML comments — including the W3TC_DYNAMIC_SECURITY security token — to be rendered in the page source. This makes it possible for unauthenticated attackers to discover the value of the W3TC_DYNAMIC_SECURITY constant by sending a crafted User-Agent header to any page that contains developer-placed dynamic fragment tags, granted the site has the fragment caching feature enabled. With the leaked W3TC_DYNAMIC_SECURITY token, an attacker can craft valid mfunc tags to execute arbitrary PHP code on the server, achieving remote code execution.

7.5 CVSS 3.1 High EPSS 2.7% · top 14.9% CWE-200 · Information exposure Deferred
7.5CVSS 3.1 base score
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

The W3 Total Cache plugin for WordPress is vulnerable to information exposure in all versions up to, and including, 2.9.3. This is due to the plugin bypassing its entire output buffering and processing pipeline when the request's User-Agent header contains "W3 Total Cache", which causes raw mfunc/mclude dynamic fragment HTML comments — including the W3TC_DYNAMIC_SECURITY security token — to be rendered in the page source. This makes it possible for unauthenticated attackers to discover the value of the W3TC_DYNAMIC_SECURITY constant by sending a crafted User-Agent header to any page that contains developer-placed dynamic fragment tags, granted the site has the fragment caching feature enabled. With the leaked W3TC_DYNAMIC_SECURITY token, an attacker can craft valid mfunc tags to execute arbitrary PHP code on the server, achieving remote code execution.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

LinkTags
https://plugins.trac.wordpress.org/browser/w3-total-cache/tags/2.9.3/Generic_Plugin.php#L1016
https://plugins.trac.wordpress.org/changeset/3495959/w3-total-cache
https://www.wordfence.com/threat-intel/vulnerabilities/id/a65eb62d-847b-4f3a-848b-1290e3118c01?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-5032), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.