CVE-2026-5032: CWE-200 Exposure of Sensitive Information to an Unauthorized Actor in boldgrid W3 Total Cache
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.
AI Analysis
Technical Summary
CVE-2026-5032 affects the W3 Total Cache plugin for WordPress (up to version 2.9.3) by exposing sensitive information through an output buffering bypass triggered when the User-Agent header contains "W3 Total Cache". This causes raw dynamic fragment HTML comments, including the W3TC_DYNAMIC_SECURITY token, to be rendered in the page source. Attackers can retrieve this token without authentication and use it to craft mfunc tags that execute arbitrary PHP code on the server, resulting in remote code execution.
Potential Impact
An unauthenticated attacker can obtain the W3TC_DYNAMIC_SECURITY token by sending a specially crafted User-Agent header, which leads to exposure of sensitive information. Using this token, the attacker can execute arbitrary PHP code on the affected server, potentially compromising the entire system. This vulnerability impacts confidentiality and could lead to full system compromise. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, it is recommended to disable the fragment caching feature or avoid using the plugin version 2.9.3 or earlier. Monitor vendor channels for updates and apply patches promptly once released.
CVE-2026-5032: CWE-200 Exposure of Sensitive Information to an Unauthorized Actor in boldgrid W3 Total Cache
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-5032 affects the W3 Total Cache plugin for WordPress (up to version 2.9.3) by exposing sensitive information through an output buffering bypass triggered when the User-Agent header contains "W3 Total Cache". This causes raw dynamic fragment HTML comments, including the W3TC_DYNAMIC_SECURITY token, to be rendered in the page source. Attackers can retrieve this token without authentication and use it to craft mfunc tags that execute arbitrary PHP code on the server, resulting in remote code execution.
Potential Impact
An unauthenticated attacker can obtain the W3TC_DYNAMIC_SECURITY token by sending a specially crafted User-Agent header, which leads to exposure of sensitive information. Using this token, the attacker can execute arbitrary PHP code on the affected server, potentially compromising the entire system. This vulnerability impacts confidentiality and could lead to full system compromise. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, it is recommended to disable the fragment caching feature or avoid using the plugin version 2.9.3 or earlier. Monitor vendor channels for updates and apply patches promptly once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-03-27T16:09:57.552Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69ce206de6bfc5ba1dba1550
Added to database: 4/2/2026, 7:53:17 AM
Last enriched: 4/9/2026, 11:39:25 AM
Last updated: 5/20/2026, 8:52:21 PM
Views: 87
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