CVE-2021-3921

Cross-Site Request Forgery (CSRF) in firefly-iii/firefly-iii

5.4 MediumFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: Low

Exploit likelihood

0.44%Down 0.2 points since Nov 14, 2021

What each source reports

CVE List Score used 5.4

Cross-Site Request Forgery (CSRF) in firefly-iii/firefly-iii

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

Record: CVE-2021-3921
CVSS 3.0: 5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Weakness: CWE-352
Updated: 2026-11-02

EUVDEUVD-2021-2376 5.4

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

Record: EUVD-2021-2376
CVSS 3.0: 5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Updated: 2026-11-03

GitHub AdvisoriesGHSA-q2cv-94xm-qvg4 5.4

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

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

Record: GHSA-q2cv-94xm-qvg4
CVSS 3.0: 5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Weakness: CWE-352
Updated: 2026-11-02

NVD 4.3

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

Record: CVE-2021-3921
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CVSS 3.0: 5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-352
Updated: 2026-11-02

OSV 4.3

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

Record: CVE-2021-3921
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVGHSA-q2cv-94xm-qvg4 5.4

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

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

Record: GHSA-q2cv-94xm-qvg4
CVSS 3.0: 5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Weakness: CWE-352
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`grumpydictator/firefly-iii` Packagist	before 5.6.3	5.6.3
`grumpydictator/firefly-iii` Packagist	before 5.6.3, plus listed versions 3.0.03.0.13.0.23.0.33.1 Show 45 moreShow less 3.1.13.1.23.1.33.1.43.1.53.1.63.103.10.13.10.23.10.33.10.43.2.03.2.13.2.23.2.33.2.43.2.53.33.3.13.3.23.3.33.3.43.3.53.3.63.3.73.3.83.3.93.43.4.0.13.4.0.103.4.0.23.4.0.33.4.0.43.4.0.53.4.0.63.4.0.73.4.0.83.4.0.93.4.13.4.103.4.113.4.23.4.33.4.43.4.4.1	5.6.3

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-3921 is a medium vulnerability (CVSS 5.4) in Firefly-iii Firefly-iii/firefly-iii, published November 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.44%, the 38th percentile. Fixed in grumpydictator/firefly-iii 5.6.3.

References

This page doesn't list everything

Left out here: 199 versions. The JSON record has them.