What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-02 · updated 2026-07-24
• Weakness: CWE-22

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.

Affected products

• ShaneIsrael fireshare: before 1.5.3 — fixed in 1.5.3

How to fix

Upgrade to a fixed version: ShaneIsrael fireshare 1.5.3. Check the vendor advisory for mitigations.

References

• https://github.com/ShaneIsrael/fireshare/commit/b76915607924756e6fa1a5f6c8823c38d611fb24
• https://github.com/ShaneIsrael/fireshare/pull/520
• https://github.com/ShaneIsrael/fireshare/releases/tag/v1.5.3
• https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-fvvp-rj8g-c7gc

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