CVE-2021-3819

Name: CVE-2021-3819
Creator: NVD / NIST
Published: 2021-09-27T13:15:07.83+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.52%

Last modified Jun 17, 2026

CVE-2021-3819 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF). EPSS estimates a 0.52% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.52%

40.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Firefly-Iii	Firefly Iii	< 5.6.1

References

https://github.com/firefly-iii/firefly-iii/commit/578f350498b75f31d321c78a608c7f7b3b7b07e9Patch, Third Party Advisory
https://huntr.dev/bounties/da82f7b6-4ffc-4109-87a4-a2a790bd44e5Exploit, Patch, Third Party Advisory
https://github.com/firefly-iii/firefly-iii/commit/578f350498b75f31d321c78a608c7f7b3b7b07e9Patch, Third Party Advisory
https://huntr.dev/bounties/da82f7b6-4ffc-4109-87a4-a2a790bd44e5Exploit, Patch, Third Party Advisory

Timeline

Published: Sep 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3819?

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

How severe is CVE-2021-3819?

CVE-2021-3819 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.52% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3819?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3819?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST