by Kastro
Paper/Archive/CVE-2026-34745

CVE-2026-34745

ShaneIsrael fireshare — Unauthenticated Path Traversal Arbitrary File Write in /api/uploadChunked/public

EPSS 0.6%public exploitCVSS 9.1
critical.is priorityof 100
47
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 50.3.503 × 2010.1Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
fireshare< 1.5.3–CNA

Scores by source

GitHub_M (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: partial

References

refgithub.com/ShaneIsrael/fireshare/security/advisories/GHSA-fvvp-rj8g-c7gcrefgithub.com/ShaneIsrael/fireshare/pull/520refgithub.com/ShaneIsrael/fireshare/commit/b76915607924756e6fa1a5f6c8823c38d611fb24refgithub.com/ShaneIsrael/fireshare/releases/tag/v1.5.3