C5 Firefly III CSV Injection.

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.0 · CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Summary CSV injection is a vulnerability where untrusted user input in CSV files can lead to unauthorized access or data manipulation. In my subsequent testing of the application. Details I discovered that there is an option to "Export Data" from the web app to your personal computer, which exports a "csv" file that can be opened with Excel software that supports macros. P.S I discovered that the web application's is offering a demo-site that anyone may access to play with the web application. So, there's a chance that someone will export the data (CVS) from the demo site and execute it on their PC, giving the malicious actor a complete control over their machine. (if a user enters a malicious payload to the website). PoC You can check out my vulnerability report if you need more details/PoC with screenshots: (removed by JC5) Impact An attacker can exploit this by entering a specially crafted payload to one of the fields, and when a user export the csv file using the "Export Data"…

Published by the source

31 Jan 2024, 18:05 UTC

Last modified by the source

31 Jan 2024, 18:05 UTC

Source last checked

26 Oct 2026, 14:15 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-29w6-c52g-m8jc

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# Patch Next advisory brief: GHSA-29w6-c52g-m8jc

Advisory: C5 Firefly III CSV Injection.
IDs: GHSA-29w6-c52g-m8jc
Record: https://patchnext.com/advisories/ghsa-29w6-c52g-m8jc (revision 1, source checked 26 Oct 2026, 14:15 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: grumpydictator/firefly-iii 6.1.7. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist grumpydictator/firefly-iii: affected < 6.1.7; fixed in 6.1.7

## Suggested inspection (read-only)
- Packagist grumpydictator/firefly-iii: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on grumpydictator/firefly-iii.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-29w6-c52g-m8jc (GitHub-reviewed advisory GHSA-29w6-c52g-m8jc lists affected ranges: Packagist grumpydictator/firefly-iii >=0 <6.1.7)

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