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CVE-2026-18547— Ultimate Member <= 2.12.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Textarea Profile Field with HTML Support (DOM Gadget via id Attribute)

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 – User Profile, Registration, Login, Member Directory, Content Restriction & Membership 中存在存储型跨站脚本漏洞（Stored Cross-Site Scripting, XSS），影响范围为所有 2.12.1 及更早版本。该漏洞源于对输入内容的消毒（sanitization）和输出内容的转义（escaping）处理不足。攻击者只要具备订阅者（subscriber）或更高

CVSS 6.4 · Medium

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-18547

Vulnerability Information
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Vulnerability Title
Ultimate Member <= 2.12.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Textarea Profile Field with HTML Support (DOM Gadget via id Attribute)
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 Textarea Profile Field with HTML Support (DOM Gadget via id Attribute) in all versions up to, and including, 2.12.1 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. This is possible because the wp_kses 'templates' allowlist permits the id attribute on div elements but does not neutralize unescaped quotes within its value; when pickadate.js concatenates the stored id value into an HTML string via jQuery .html() on profile page load, the smuggled onfocus and autofocus attribute syntax breaks out of attribute context and executes as JavaScript.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
ultimatemember Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin 0 ~ 2.12.1 -

II. Public POCs for CVE-2026-18547

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III. Intelligence Information for CVE-2026-18547

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Patches & Fixes for CVE-2026-18547 (3)

Vendor Advisories for CVE-2026-18547 (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-2026-18547

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