CVE-2026-18547 json
Ultimate Member <= 2.12.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Textarea Profile Field with HTML Support (DOM Gadget via id Attribute)
published 2026-08-25 2 mo ago modified 2026-09-28 41 d ago also EUVD-2026-65460
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- ultimatemember Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/a7961bcc-eae7-40e1-8838-9755c7655500?source=cve
- plugins.trac.wordpress.org /browser/ultimate-member/tags/2.12.1/includes/core/class-form.php#L853
- plugins.trac.wordpress.org /browser/ultimate-member/tags/2.12.1/includes/class-functions.php#L580
- plugins.trac.wordpress.org /browser/ultimate-member/tags/2.12.1/assets/js/common.js#L51
- plugins.trac.wordpress.org /browser/ultimate-member/tags/2.11.4/includes/core/class-form.php#L853
- plugins.trac.wordpress.org /browser/ultimate-member/tags/2.11.4/includes/class-functions.php#L580
- plugins.trac.wordpress.org /browser/ultimate-member/tags/2.11.4/assets/js/common.js#L51
- plugins.trac.wordpress.org /changeset?reponame=&old=3663931%40ultimate-member&new=3663931%40ultimate-member
Sources
- CVE List CVE-2026-18547
- NVD CVE-2026-18547
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.