CVE-2019-16971: Fusionpbx

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

In FusionPBX up to 4.5.7, the file app\messages\messages_thread.php uses an unsanitized "contact_uuid" variable coming from the URL, which is reflected on 3 occasions in HTML, leading to XSS.

Affected products

• Fusionpbx Fusionpbx: up to and including 4.5.7

Published 2019-10-22. Last modified 2026-06-17.