# CVE-2026-54337: Fireshare argument injection in video upload

Source: https://junglewise.ai/threats/cve-2026-54337-fireshare-argument-injection-in-video-upload  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-54337 · Severity: critical · CVSS 9.8 · Published 2026-09-15

Fireshare is a self-hosted media and file sharing platform. An unauthenticated attacker can exploit a flaw in the video upload function to write or overwrite arbitrary system files, potentially leading to data destruction, application compromise, or complete server takeover.

## Quick answers

**Is CVE-2026-54337 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54337 being exploited in the wild.

**How severe is CVE-2026-54337?** Critical severity, with a CVSS score of 9.8, published 15 September 2026.

**Which products and versions are affected?** Fireshare Fireshare < 1.6.14.

**Is there a fix for CVE-2026-54337?** A patch was published on 2026-06-04: Version 1.6.14 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-54337 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-54337?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an argument injection (CWE-88) in the video upload API endpoint. The vulnerable code path is: user-supplied filename and folder parameters are insufficiently sanitized (spaces are retained), then passed unsanitized to a shell command that invokes ffprobe via string splitting. An attacker can craft a filename with shell metacharacters and arguments (e.g., `-o data`) that are interpreted as ffprobe command-line flags, allowing arbitrary file writes. The attack requires only network access and no authentication. The fix was released in version 1.6.14.

## Affected products

- Fireshare Fireshare < 1.6.14

## Timeline

- 2026-06-04: disclosed
- 2026-06-04: patched: Version 1.6.14

## References

- [https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-hmh2-6g84-q8jx](https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-hmh2-6g84-q8jx)