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CVE-2026-5032— W3 Total Cache <= 2.9.3 - Unauthenticated Security Token Exposure via User-Agent Header

Quick assessment

Affected
boldgrid W3 Total Cache
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin W3 Total Cache 2.9.3及之前版本存在信息泄露漏洞，该漏洞源于请求的User-Agent标头包含W3 Total Cache时插件绕过其整个输出缓冲和处理管道，可能导致未经验证的攻击者通过发送特制Us

CVSS 7.5 · High EPSS 3.06% · P87

Public Exploits 1

Nuclei · 1 CVE-2026-5032.yaml [template]
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I. Basic Information for CVE-2026-5032

Vulnerability Information
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Vulnerability Title
W3 Total Cache <= 2.9.3 - Unauthenticated Security Token Exposure via User-Agent Header
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin W3 Total Cache 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin W3 Total Cache 2.9.3及之前版本存在信息泄露漏洞，该漏洞源于请求的User-Agent标头包含W3 Total Cache时插件绕过其整个输出缓冲和处理管道，可能导致未经验证的攻击者通过发送特制Us
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
boldgrid W3 Total Cache 0 ~ 2.9.3 -

II. Public POCs for CVE-2026-5032

# POC Description Source Link Shenlong Link
1 The W3 Total Cache WordPress plugin through version 2.9.3 skips its entire output buffering and processing pipeline whenever an incoming request's User-Agent header contains the string "W3 Total Cache", without authenticating the caller. On sites that use developer-placed dynamic fragment tags, the raw mfunc/mclude HTML comments - which embed the per-site W3TC_DYNAMIC_SECURITY token - are therefore rendered directly into the page source instead of being processed and stripped, letting an unauthenticated attacker harvest the token by comparing a normal response against one sent with the magic User-Agent. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-5032.yaml POC Details
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default-local-qwen3.6 · 12036 chars
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III. Intelligence Information for CVE-2026-5032

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Vendor Advisories for CVE-2026-5032 (1)

IV. Related Vulnerabilities

Same product: W3 Total Cache
Same vendor: boldgrid
Same weakness: CWE-200

V. Comments for CVE-2026-5032

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