Unauthenticated Path Traversal Arbitrary File Write in /api/uploadChunked/public

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Summary

CVECVE-2026-34745
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-02 19:21:33 UTC
Updated2026-04-02 19:21:33 UTC
DescriptionFireshare 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ShaneIsrael Fireshare affected < 1.5.3 Not specified

References

ReferenceSourceLinkTags
github.com/ShaneIsrael/fireshare/security/advisories/GHSA-fvvp-rj8g-c7gc [email protected] github.com
github.com/ShaneIsrael/fireshare/commit/b76915607924756e6fa1a5f6c8823c38... [email protected] github.com
github.com/ShaneIsrael/fireshare/pull/520 [email protected] github.com
github.com/ShaneIsrael/fireshare/releases/tag/v1.5.3 [email protected] github.com
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