# CVE-2026-8489: Ultimate Member WordPress plugin stored XSS in about_me parameter

Source: https://junglewise.ai/threats/cve-2026-8489-ultimate-member-wordpress-plugin-stored-xss-in-about-me-parameter  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-03. Updated: 2026-07-03  
License: CC BY 4.0 with a link back

CVE-2026-8489 · Severity: medium · CVSS 6.4 · Published 2026-07-03

The Ultimate Member plugin for WordPress, which manages user profiles and memberships, contains a security flaw that allows users with basic account access to inject malicious scripts into the website. These scripts can automatically run in the browsers of other visitors or administrators who view the affected profile pages. This could lead to unauthorized actions being performed on behalf of other users or the theft of sensitive session information.

Technologies: [Ultimate Member](https://junglewise.ai/threats/technologies/ultimate-member). Vendors: [Ultimate Member](https://junglewise.ai/threats/vendors/ultimate-member).

## Quick answers

**Is CVE-2026-8489 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-8489 being exploited in the wild.

**How severe is CVE-2026-8489?** Medium severity, with a CVSS score of 6.4, published 3 July 2026.

**Which products and versions are affected?** Ultimate Member <= 2.11.4.

**Is there a fix for CVE-2026-8489?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-8489 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-8489?** Check whether you run Ultimate Member at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Ultimate Member plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) due to insufficient input sanitization and output escaping on the 'about_me' parameter. Authenticated attackers with subscriber-level permissions or higher can inject arbitrary web scripts into their profile fields. These scripts are stored on the server and execute in the context of any user who views the compromised profile or member directory page. The vulnerability exists in all versions up to and including 2.11.4. A patch is expected in subsequent versions to address the lack of proper neutralization during web page generation (CWE-79).

## Affected products

- Ultimate Member Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin <= 2.11.4

## Timeline

- 2026-07-03: disclosed: CVE published by Wordfence and NVD

## References

- [https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/class-fields.php](https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/class-fields.php)
- [https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/class-form.php](https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/class-form.php)
- [https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/class-profile.php](https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/class-profile.php)
- [https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/um-actions-form.php](https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/um-actions-form.php)
- [https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/um-filters-fields.php](https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.2/includes/core/um-filters-fields.php)
- [https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/core/class-fields.php](https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/core/class-fields.php)
- [https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/core/class-form.php](https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.11.4/includes/core/class-form.php)

## Related threats

- [Ultimate Member plugin stored cross-site scripting in textarea field](https://junglewise.ai/threats/cve-2026-116621-the-ultimate-member-user-profile-registration-login-member)
- [Ultimate Member plugin PHP object injection](https://junglewise.ai/threats/cve-2026-115968-deserialization-of-untrusted-data-vulnerability-in-ultimate)
- [Ultimate Member WordPress plugin Stored XSS in user_url parameter](https://junglewise.ai/threats/cve-2026-107625-the-ultimate-member-user-profile-registration-login-member)
- [Ultimate Member privilege escalation in role assignment](https://junglewise.ai/threats/cve-2026-96539-incorrect-privilege-assignment-vulnerability-in-ultimate-member)
- [Ultimate Member privilege escalation in user authorization](https://junglewise.ai/threats/cve-2026-96451-authorization-bypass-through-user-controlled-key-vulnerability-in)