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CVE-2026-85679— Extendify <= 3.1.6 - Unauthenticated Stored Cross-Site Scripting via 'styles.blocks' Block Type Key

Quick assessment

Affected
extendify Extendify
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 Extendify 插件存在存储型跨站脚本（Stored XSS）漏洞，该漏洞存在于所有 3.1.6 及更早版本中，原因是输入净化不足且输出未进行转义。这使得未经身份验证的攻击者能够在页面中注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本将被执行。该漏洞之所以可能发生，是因为 函数被挂载到 钩子上，并在 WordPress 评估路由的 （权限回调）之前执行。因此，任何针对 路由的未经身份验证的 POST、PUT 或 PATCH 请求均可触发存在漏洞的代码路径。

CVSS 7.2 · High

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-85679

Vulnerability Information
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Vulnerability Title
Extendify <= 3.1.6 - Unauthenticated Stored Cross-Site Scripting via 'styles.blocks' Block Type Key
Source: CVE Program / CVE List V5
Vulnerability Description
The Extendify plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'styles.blocks' Block Type Key in all versions up to, and including, 3.1.6 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 is possible because registerIncoming() is hooked on rest_request_before_callbacks and runs before WordPress evaluates the route's permission_callback, meaning any unauthenticated POST, PUT, or PATCH request to a /wp/v2/global-styles route can trigger the vulnerable code path.
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
extendify Extendify 0 ~ 3.1.6 -

II. Public POCs for CVE-2026-85679

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III. Intelligence Information for CVE-2026-85679

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Other References for CVE-2026-85679 (8)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-85679

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