Critical 9.1Published Apr 2, 2026

CVE-2026-34745Unauthenticated Path Traversal Arbitrary File Write in /api/uploadChunked/public

Updated under an hour ago (Oct 26, 2026, 8:40 AM ET)

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It affects ShaneIsrael fireshare. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for ShaneIsrael fireshare

Exploited in the last 30 days

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: 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 2, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ShaneIsrael fireshare shaneisrael:fireshare (from the name)	before 1.5.3	CNA record
shaneisrael fireshare shaneisrael:fireshare	before 1.5.3	NVD

References

https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-fvvp-rj8g-c7gcx-refsource-confirm, exploit, mitigation, vendor-advisory
https://github.com/ShaneIsrael/fireshare/pull/520x-refsource-misc, issue-tracking, patch
https://github.com/ShaneIsrael/fireshare/commit/b76915607924756e6fa1a5f6c8823c38d611fb24x-refsource-misc, patch
https://github.com/ShaneIsrael/fireshare/releases/tag/v1.5.3x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.