Path Traversal in Shaneisrael Fireshare
CVE-2026-34745
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.001
Affected products
- Shaneisrael Fireshare — versions < 1.5.3
Weakness classification (CWE)
References
- github.com/ShaneIsrael/fireshare/security/advisories/GHSA-fvvp-rj8g-c7gc (Exploit, Mitigation, Vendor Advisory)
- github.com/ShaneIsrael/fireshare/pull/520 (Patch, Issue Tracking)
- github.com/ShaneIsrael/fireshare/commit/b76915607924756e6fa1a5f6c8823c38d611fb24 (Patch)
- github.com/ShaneIsrael/fireshare/releases/tag/v1.5.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-34745?
- CVE-2026-34745 is a critical-severity vulnerability in Shaneisrael Fireshare, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-04-02.
- How severe is CVE-2026-34745?
- Critical severity. CVSS v3 base score is 9.1 out of 10.