Ultimate Member Plugin up to 2.12.1 on WordPress Textarea Profile Field pickadate.js html ID cross site scripting

Summaryinfo

A vulnerability labeled as problematic has been found in Ultimate Member Plugin up to 2.12.1. Affected is the function html of the file pickadate.js of the component Textarea Profile Field. Executing a manipulation of the argument ID can lead to cross site scripting. This vulnerability is registered as CVE-2026-18547. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in Ultimate Member Plugin up to 2.12.1. This vulnerability affects the function html of the file pickadate.js of the component Textarea Profile Field. The manipulation of the argument id with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability was named CVE-2026-18547 since 07/31/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Name

• Ultimate Member Plugin

Version

• 2.12.0
• 2.12.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

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Once again VulDB remains the best source for vulnerability data.

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