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CVE-2026-96270— Ultimate Member <= 2.13.1 - Unauthenticated Stored Cross-Site Scripting via 'form_id' Parameter

Quick assessment

Affected
ultimatemember Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin
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 插件 Ultimate Member（功能包括用户个人资料、注册、登录、会员目录、内容限制及会员管理）存在存储型跨站脚本（XSS）漏洞。该漏洞影响所有 2.13.1 及更早版本，原因是插件对 参数缺乏充分的输入清理和输出转义。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，当用户访问被植入恶意脚本的页面时，这些脚本便会执行。恶意负载会通过 函数存储在注册用户的 'submitted' 用户元数据（usermeta）中，仅在管理员通过 wp-admin 的用户模态窗口打开受影响的特定

CVSS 7.2 · High

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-96270

Vulnerability Information
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Vulnerability Title
Ultimate Member <= 2.13.1 - Unauthenticated Stored Cross-Site Scripting via 'form_id' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'form_id' parameter in all versions up to, and including, 2.13.1 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. The injected payload is stored in the registering user's 'submitted' usermeta via update_user_meta() and is only triggered when an administrator opens the affected user record in the wp-admin Users modal, which inserts the unescaped output via jQuery .html().
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
ultimatemember Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin 0 ~ 2.13.1 -

II. Public POCs for CVE-2026-96270

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III. Intelligence Information for CVE-2026-96270

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Vendor Advisories for CVE-2026-96270 (1)

Vendor Pages for CVE-2026-96270 (1)

IV. Related Vulnerabilities

Same product: Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin
Same vendor: ultimatemember
Same weakness: CWE-79

V. Comments for CVE-2026-96270

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