EUVD-2026-16416CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
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Description
Fireshare facilitates self-hosted media and link sharing. In version 1.5.1, an authenticated path traversal vulnerability in Fireshare’s chunked upload endpoint allows an attacker to write arbitrary files outside the intended upload directory. The `checkSum` multipart field is used directly in filesystem path construction without sanitization or containment checks. This enables unauthorized file writes to attacker-chosen paths writable by the Fireshare process (e.g., container `/tmp`), violating integrity and potentially enabling follow-on attacks depending on deployment. Version 1.5.2 fixes the issue.
Analysis
Fireshare version 1.5.1 allows authenticated remote attackers to write arbitrary files outside the intended upload directory through unsanitized path traversal in the chunked upload endpoint's checkSum parameter. The vulnerability enables attackers with valid credentials to write files to any location accessible to the Fireshare process, potentially compromising system integrity or enabling secondary attacks. …
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Remediation
Within 24 hours: Audit current Fireshare deployment to confirm version and identify any suspicious file writes in non-standard directories. Within 7 days: Upgrade to Fireshare 1.5.2 or later. …
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External POC / Exploit Code
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