CVE-2026-54223: Ubb Systems Ubb.threads

High severity, CVSS 8.6. EPSS: 0.8% chance of exploitation in the next 30 days.

UBB.threads is vulnerable to Path traversal, allowing attackers with privilege to edit templates to read and write any file on the application’s server that application has privileges to, what results in Remote Code Execution.  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.