CVE-2026-34745 | THREATINT

Description

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.

PUBLISHED Reserved 2026-03-30 | Published 2026-04-02 | Updated 2026-04-02 | Assigner GitHub_M

CRITICAL: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Problem types

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Product status

< 1.5.3

affected

References

github.com/...eshare/security/advisories/GHSA-fvvp-rj8g-c7gc

github.com/ShaneIsrael/fireshare/pull/520

github.com/...ommit/b76915607924756e6fa1a5f6c8823c38d611fb24

github.com/ShaneIsrael/fireshare/releases/tag/v1.5.3

cve.org (CVE-2026-34745)

nvd.nist.gov (CVE-2026-34745)

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