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CVE-2026-87920— W3 Total Cache <= 2.10.6 - Unauthenticated Stored Cross-Site Scripting via Comment Content

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 插件存在存储型跨站脚本漏洞（Stored XSS），该漏洞存在于所有 2.10.6 及更早版本中，原因是输入清理和输出转义不足。攻击者可以通过评论内容的输出缓冲正则表达式重写，在网站上注入任意 Web 脚本，当用户访问被注入的页面时，脚本将自动执行。此漏洞仅在 W3 Total Cache 中启用了 'Remove query strings from static resources'（移除静态资源的查询字符串）选项时才可利用，因为 函数需要删除 '?' 分隔

CVSS 7.2 · High EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
boldgrid W3 Total Cache ≤ 2.10.6 affected
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I. Basic Information for CVE-2026-87920

Vulnerability Information
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Vulnerability Title
W3 Total Cache <= 2.10.6 - Unauthenticated Stored Cross-Site Scripting via Comment Content
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 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.
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 ~ 2.10.6 -

II. Public POCs for CVE-2026-87920

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III. Intelligence Information for CVE-2026-87920

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Patches & Fixes for CVE-2026-87920 (4)

Vendor Advisories for CVE-2026-87920 (1)

IV. Related Vulnerabilities

Same product: W3 Total Cache
Same vendor: boldgrid
Same weakness: CWE-79

V. Comments for CVE-2026-87920

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