CVE-2026-34745
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk46th percentile - higher than 46% of all known CVEs
Summary
Fireshare, a self-hosted media and link sharing tool, prior to version 1.5.3 contains a vulnerability in the unauthenticated /api/uploadChunked/public endpoint. The fix for CVE-2026-33645 was applied only to the authenticated endpoint, not the public one. An unauthenticated attacker can exploit the checkSum parameter to write arbitrary files with attacker-controlled content to any writable path on the server. The issue is patched in version 1.5.3.
Risk Assessment
An unauthenticated attacker can write malicious files to the server, potentially leading to remote code execution or website defacement.
Recommendation
Immediately update Fireshare to version 1.5.3 or later.
Original NVD description (English source)
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.