CVE-2023-3521: Fossbilling

Medium severity, CVSS 6.1. EPSS: 0.9% chance of exploitation in the next 30 days.

Cross-site Scripting (XSS) - Reflected in GitHub repository fossbilling/fossbilling prior to 0.5.4.

Affected products

• Fossbilling Fossbilling: before 0.5.4 (fixed in 0.5.4)

Published 2023-07-06. Last modified 2026-06-17.