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CVE-2026-8489— Ultimate Member <= 2.11.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Non-HTML Custom Textarea Profile Field

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.

ultimatemember ultimate member是ultimatemember团队开源的一个WordPress会员插件。 Ultimate Member 2.11.4及之前版本存在跨站脚本漏洞，该漏洞源于对 'about_me' 参数的输入清理和输出转义不足，可能导致经过身份验证的攻击者（具有订阅者级别及以上访问权限）在页面中注入任意Web脚本，当用户访问该页面时执行。

CVSS 6.4 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-8489

Vulnerability Information
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Vulnerability Title
Ultimate Member <= 2.11.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Non-HTML Custom Textarea Profile Field
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 'about_me' parameter in all versions up to, and including, 2.11.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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
Vulnerability Title
Ultimate Member 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ultimatemember ultimate member是ultimatemember团队开源的一个WordPress会员插件。 Ultimate Member 2.11.4及之前版本存在跨站脚本漏洞，该漏洞源于对 'about_me' 参数的输入清理和输出转义不足，可能导致经过身份验证的攻击者（具有订阅者级别及以上访问权限）在页面中注入任意Web脚本，当用户访问该页面时执行。
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
ultimatemember Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin 0 ~ 2.11.4 -

II. Public POCs for CVE-2026-8489

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III. Intelligence Information for CVE-2026-8489

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Patches & Fixes for CVE-2026-8489 (1)

Vendor Advisories for CVE-2026-8489 (1)

Other References for CVE-2026-8489 (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-2026-8489

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