CVE-2021-3851: Firefly-Iii Firefly Iii

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

firefly-iii is vulnerable to URL Redirection to Untrusted Site

Affected products

• Firefly-Iii Firefly Iii: before 5.6.2 (fixed in 5.6.2)

Published 2021-10-19. Last modified 2026-06-17.