CVE-2021-3921 json
Cross-Site Request Forgery (CSRF) in firefly-iii/firefly-iii
published 2021-11-13 4 y ago modified 2026-06-17 4 mo ago also GHSA-q2cv-94xm-qvg4 , EUVD-2021-2376
- cvss
- 5.4
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 38%
- public exploits
- 0
- none known
Summary
firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)
Patch / fix
- packagist grumpydictator/firefly-iii 5.6.3
- firefly-iii firefly-iii/firefly-iii 5.6.3
Exploit prediction
0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- huntr.dev https://huntr.dev/bounties/724d3fd5-9f04-45c4-98d6-35a7d15468f5 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 5.4 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L |
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| GitHub | 3.0 | 5.4 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | grumpydictator/firefly-iii | <5.6.3 |
5.6.3 |
Affected products
- firefly-iii firefly-iii/firefly-iii
Classification
- Weakness
-
- CWE-352 Cross-Site Request Forgery
References
-
github.com
/firefly-iii/firefly-iii/commit/47fa9e39561a9ec9e210e4023d090a7b33381684
web, patch, third-party-advisory
-
huntr.dev
/bounties/724d3fd5-9f04-45c4-98d6-35a7d15468f5
web, exploit, patch, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-3921
advisory
-
github.com
/firefly-iii/firefly-iii
package
Sources
- CVE List CVE-2021-3921
- GitHub Advisory GHSA-q2cv-94xm-qvg4
- NVD CVE-2021-3921
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.