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MEDIUM severity

CVE-2021-3729 — firefly-iii

MEDIUMFix: firefly-iii/firefly-iii@06d319c

CVE-2021-3729 is a medium-severity (CVSS 4.3) Cross-Site Request Forgery (CSRF) vulnerability in grumpydictator/firefly-iii. A fix is available for grumpydictator/firefly-iii — see the affected versions and patch details below.

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

Also known asGHSA-gp6w-ccqv-p7qr
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs33th percentile — riskier than 33% of all scored CVEsHighest risk
0.00%0.30%0.60%0.90%0.1%0.4%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-3729 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐘grumpydictator/firefly-iii

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistgrumpydictator/firefly-iiiall versions5.6.0composer require grumpydictator/firefly-iii:^5.6.0

Affected Products

1 product · 1 configurations
Application
firefly iiifirefly-iii
all

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for grumpydictator/firefly-iii, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update grumpydictator/firefly-iii to 5.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-3729 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)
O3 Security · Impact-Aware SCA

Is CVE-2021-3729 in your dependencies?

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CVE-2021-3729: firefly-iii CSRF — Fixed in 5.6.0