CVE-2024-37893 json
MFA bypass in oauth flow in Firefly III
published 2024-06-17 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-1910 , GHSA-4gm4-c4mh-4p7w
- cvss
- 5.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 48%
- public exploits
- 0
- none known
Summary
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. This problem has been patched in Firefly III v6.1.17 and up. Users are advised to upgrade. Users unable to upgrade should Use a unique password for their Firefly III instance and store their password securely, i.e. in a password manager.
Patch / fix
- packagist grumpydictator/firefly-iii 6.1.17
- firefly-iii firefly_iii 6.1.17
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | grumpydictator/firefly-iii | <6.1.17 |
6.1.17 |
Affected products
- firefly-iii firefly-iii
Classification
References
-
github.com
/firefly-iii/firefly-iii/security/advisories/GHSA-4gm4-c4mh-4p7w
web
-
owasp.org
/www-community/attacks/Password_Spraying_Attack
web
-
menlosecurity.com
/what-is/highly-evasive-adaptive-threats-heat/mfa-bypass
web
-
nvd.nist.gov
/vuln/detail/CVE-2024-37893
advisory
-
github.com
/firefly-iii/firefly-iii
package
Sources
- CVE List CVE-2024-37893
- GitHub Advisory GHSA-4gm4-c4mh-4p7w
- NVD CVE-2024-37893
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.