CVE-2026-34745: critical vulnerability in ShaneIsrael fireshare
Unauthenticated Path Traversal Arbitrary File Write in /api/uploadChunked/public
Published
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.1epss 0.6%
Fireshare facilitates self-hosted media and link sharing. Prior to version 1.5.3, the fix for CVE-2026-33645 was applied to the authenticated /api/uploadChunked endpoint but was not applied to the unauthenticated /api/uploadChunked/public endpoint in the same file (app/server/fireshare/api.py). An unauthenticated attacker can exploit the checkSum parameter to write arbitrary files with attacker-controlled content to any writable path on the server filesystem. This issue has been patched in version 1.5.3.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Affected products
ShaneIsrael · fireshareRelated CVEs — ShaneIsrael fireshare
In the same product, most dangerous first.
CVE-2025-67728CRITICALFireshare Public Uploads feature is vulnerable to OS Command Injection (RCE)EPSS 0.7%CVE-2026-54337CRITICALFireshare has Unauthenticated Argument Injection to Arbitrary File Write/OverwriteEPSS 0.6%CVE-2026-33645HIGHFireshare has Path Traversal Arbitrary File Write in `/api/uploadChunked`EPSS 0.4%CVE-2026-54544HIGHFireshare has unauthenticated SSRF via missing login_required on webhook test endpointsEPSS 0.4%