CVE-2021-4015: Firefly-Iii Firefly Iii

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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

Affected products

• Firefly-Iii Firefly Iii: before 5.6.4 (fixed in 5.6.4)

Published 2021-12-01. Last modified 2026-06-17.