Ultimate Member <= 2.12.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Textarea Profile Field with HTML Support (DOM Gadget via id Attribute)
Summary
| CVE | CVE-2026-18547 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-25 12:16:23 UTC |
| Updated | 2026-08-25 12:16:23 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 6.4 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 6.4 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
| 3.1 | CNA | DECLARED | 6.4 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
LowIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Ultimatemember | Ultimate Member User Profile Registration Login Member Directory Content Restriction Membership Plugin | affected 2.12.1 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| plugins.trac.wordpress.org/browser/ultimate-member/tags/2.12.1/includes/class-functions.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/assets/js/common.js | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ultimate-member/tags/2.12.1/assets/js/common.js | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ultimate-member/tags/2.12.1/includes/core/class-form.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/class-functions.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/core/class-form.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/changeset | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/a7961bcc-eae7-40e1-8838-9755c... | [email protected] | www.wordfence.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: tiborisaak (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-07-31T21:40:44.000Z | Vendor Notified |
| CNA | 2026-08-24T22:59:21.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.