#VU56697 Cross-site request forgery in Firefly III - CVE-2021-3729

Vulnerability identifier: #VU56697

Vulnerability risk: Low

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3729

CWE-ID: CWE-352

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Firefly III
Client/Desktop applications / Other client software

Vendor: James Cole

Description

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Firefly III: 3.0.0 - 5.5.13

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External links
https://huntr.dev/bounties/d32f3d5a-0738-41ba-89de-34f2a772de76
https://github.com/firefly-iii/firefly-iii/commit/06d319cd71b7787aa919b3ba1ccf51e4ade67712

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.