CVE-2026-33645: Fireshare facilitates self-hosted media and link sharing. In version 1.5.1, an authenticated path traversal vulnerability in Fireshare’s chunked upload…

PriorityP355high8.1CVSS 3.1

AVNACLPRLUINSUCNIHAH

EPSS

0.43%

34.5th percentile

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
shaneisrael	fireshare	< 1.5.3	1.5.3
shaneisrael	fireshare	< 1.5.3	1.5.3
shaneisrael	fireshare	—	—

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