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Fencer Intel
medium 4.3

CVE-2021-3819 json

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

published 5y ago modified 4mo ago also GHSA-356r-77q8-f64f , EUVD-2021-1958

cvss
4.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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

Patch / fix

  • packagist grumpydictator/firefly-iii 5.6.1
  • firefly-iii firefly-iii/firefly-iii 5.6.1

Is CVE-2021-3819 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • huntr.dev https://huntr.dev/bounties/da82f7b6-4ffc-4109-87a4-a2a790bd44e5 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 4.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub 3.0 4.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
packagist grumpydictator/firefly-iii
<5.6.1
5.6.1

Affected products

  • firefly-iii firefly-iii/firefly-iii

Classification

Weakness
  • CWE-352 Cross-Site Request Forgery

References

Sources

Fencer Intel 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.