# CVE-2026-11766: Ultimate Member WordPress plugin stored XSS in custom textarea profile fields

Source: https://junglewise.ai/threats/cve-2026-11766-ultimate-member-wordpress-plugin-stored-xss-in-custom-textarea  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-06. Updated: 2026-07-06  
License: CC BY 4.0 with a link back

CVE-2026-11766 · Severity: info · CVSS 8 · Published 2026-07-06

Ultimate Member, a popular WordPress plugin used for user profiles and community management, contains a security flaw in how it handles user-provided text. An attacker with a basic user account can save malicious scripts into their profile fields. If an administrator or another user views that profile, the script will execute in their browser, potentially allowing the attacker to hijack administrative sessions or perform unauthorized actions on the website.

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

## Quick answers

**Is CVE-2026-11766 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-11766 being exploited in the wild.

**How severe is CVE-2026-11766?** Informational severity, with a CVSS score of 8, published 6 July 2026.

**Which products and versions are affected?** Ultimate Member before 2.12.0.

**Is there a fix for CVE-2026-11766?** A patch was published on 2026-06-15: Fixed in version 2.12.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-11766 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-11766?** 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

A Stored Cross-Site Scripting (XSS) vulnerability exists in the Ultimate Member plugin for WordPress in versions prior to 2.12.0. The root cause is a failure to properly sanitize and escape user input within custom textarea profile fields before it is rendered on the profile page. An authenticated attacker with at least Subscriber-level privileges can inject malicious JavaScript into these fields. When a victim, such as a site administrator, views the compromised profile, the script executes within the context of the victim's session. This can lead to session hijacking, unauthorized configuration changes, or further exploitation of the WordPress environment. The issue is resolved in version 2.12.0.

## Affected products

- Ultimate Member Ultimate Member before 2.12.0

## Timeline

- 2026-06-15: disclosed: Publicly published by WPScan
- 2026-07-06: advisory: NVD publication date
- 2026-06-15: patched: Fixed in version 2.12.0

## References

- [https://wpscan.com/vulnerability/96adb2d3-af34-4455-97d4-90af58049e78/](https://wpscan.com/vulnerability/96adb2d3-af34-4455-97d4-90af58049e78/)

## 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)