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CVE-2026-54337

CriticalPublished

Fireshare has Unauthenticated Argument Injection to Arbitrary File Write/Overwrite

Published: Sep 15, 2026
Updated: Sep 16, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 37.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Fireshare facilitates self-hosted media and link sharing. Prior to version 1.6.14, an argument Injection in the video upload function allows unauthenticated attacker to write/overwrite system files. Version 1.6.14 fixes the issue.

Sources

CVE-2026-54337-PoCPoC
CVE-2026-54337 - Unauthenticated File Write/Overwrite PoC for fireshare <= 1.16.3

Responsible use

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