CVE-2020-21054: Fusionpbx

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

Cross Site Scripting (XSS) vulnerability in FusionPBX 4.5.7 allows remote malicious users to inject arbitrary web script or HTML via an unsanitized "f" variable in app\vars\vars_textarea.php.

Affected products

• Fusionpbx Fusionpbx: version 4.5.7 only

Published 2021-05-20. Last modified 2026-06-17.