CVE-2026-54219: Ubb Systems Ubb.threads

Medium severity, CVSS 5.1. EPSS: 0.4% chance of exploitation in the next 30 days.

UBB.threads is vulnerable to Stored XSS via user posts and user profile fields. The application fails to properly sanitize user input, allowing low privileged attackers to inject arbitrary JavaScript that executes in a victim's browser upon viewing. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 7.7.5 but may also affect other versions.

Affected products

• Ubb Systems Ubb.threads: up to and including 7.7.5

Published 2026-06-18. Last modified 2026-06-18.