CVE-2021-3900: Firefly-Iii Firefly Iii

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)

Affected products

• Firefly-Iii Firefly Iii: up to and including 5.6.2

Published 2021-10-27. Last modified 2026-06-17.