CVE-2024-37893 – MFA bypass in oauth flow in Firefly III

https://notcve.org/view.php?id=CVE-2024-37893

Firefly III is a free and open source personal finance manager. In affected versions an MFA bypass in the Firefly III OAuth flow may allow malicious users to bypass the MFA-check. This allows malicious users to use password spraying to gain access to Firefly III data using passwords stolen from other sources. As OAuth applications are easily enumerable using an incrementing id, an attacker could try sign an OAuth application up to a users profile quite easily if they have created one. The attacker would also need to know the victims username and password. • https://github.com/firefly-iii/firefly-iii/security/advisories/GHSA-4gm4-c4mh-4p7w https://owasp.org/www-community/attacks/Password_Spraying_Attack https://www.menlosecurity.com/what-is/highly-evasive-adaptive-threats-heat/mfa-bypass • CWE-287: Improper Authentication CWE-288: Authentication Bypass Using an Alternate Path or Channel •