CVE-2021-3729

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

4.3 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: None
Availability: Low

Exploit likelihood

0.40%Down 0.2 points since Aug 24, 2021

What each source reports

CVE List Score used 4.3

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

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

Record: CVE-2021-3729
CVSS 3.0: 4.3 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness: CWE-352
Updated: 2026-11-02

EUVDEUVD-2021-1725 4.3

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

Record: EUVD-2021-1725
CVSS 3.0: 4.3 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Updated: 2026-11-03

GitHub AdvisoriesGHSA-gp6w-ccqv-p7qr 4.3

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

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

Record: GHSA-gp6w-ccqv-p7qr
CVSS 3.0: 4.3 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness: CWE-352
Updated: 2026-11-02

NVD 4.3

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

Record: CVE-2021-3729
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: 4.3 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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-2021-3729
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-gp6w-ccqv-p7qr 4.3

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

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

Record: GHSA-gp6w-ccqv-p7qr
CVSS 3.0: 4.3 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness: CWE-352
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`grumpydictator/firefly-iii` Packagist	before 5.6.0	5.6.0
`grumpydictator/firefly-iii` Packagist	before 5.6.0, 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	5.6.0

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-2021-3729 is a medium vulnerability (CVSS 4.3) in Firefly-iii Firefly-iii/firefly-iii, published August 23, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. Fixed in grumpydictator/firefly-iii 5.6.0.

References

This page doesn't list everything

Left out here: 196 versions. The JSON record has them.