CVE-2026-54337: Fireshare has Unauthenticated Argument Injection to Arbitrary File Write/Overwrite

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-15 · updated 2026-09-30
Weakness: CWE-88

Description

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.

Affected products

ShaneIsrael fireshare: before 1.6.14

References

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

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