CVE-2026-78438— W3 Total Cache <= 2.10.5 - Unauthenticated Stored Cross-Site Scripting via LazyLoad Background Mutator
Quick assessment
Affected
boldgrid W3 Total Cache
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
WordPress 的 W3 Total Cache 插件（所有版本，直至并包括 2.10.5）存在存储型跨站脚本攻击（Stored Cross-Site Scripting）漏洞，根源在于输入净化和输出转义不足，攻击路径通过“LazyLoad Background Mutator”中的评论内容实现。该漏洞允许未经身份验证的攻击者向页面注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本会被执行。触发此漏洞需要满足以下条件： 1. 启用“Lazy Load Images”功能中的“Process backgr
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I. Basic Information for CVE-2026-78438
Vulnerability Information
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Vulnerability Title
W3 Total Cache <= 2.10.5 - Unauthenticated Stored Cross-Site Scripting via LazyLoad Background Mutator
Source: CVE Program / CVE List V5
Vulnerability Description
The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content via LazyLoad Background Mutator in all versions up to, and including, 2.10.5 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 the "Lazy Load Images" feature with "Process background images" to be enabled, and the malicious comment to be approved by a moderator before execution is triggered.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| boldgrid | W3 Total Cache | 0 ~ 2.10.5 | - |
|
II. Public POCs for CVE-2026-78438
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-78438 (5)
Other References for CVE-2026-78438 (3)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-78438
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