CVE-2026-34745

Name: CVE-2026-34745
Creator: NVD / NIST
Published: 2026-04-02T19:21:33.34+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2026-34745 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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). EPSS estimates a 0.62% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

0.62%

45.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Shaneisrael	Fireshare	< 1.5.3

References

https://github.com/ShaneIsrael/fireshare/commit/b76915607924756e6fa1a5f6c8823c38d611fb24Patch
https://github.com/ShaneIsrael/fireshare/pull/520Issue Tracking, Patch
https://github.com/ShaneIsrael/fireshare/releases/tag/v1.5.3Release Notes
https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-fvvp-rj8g-c7gcExploit, Mitigation, Vendor Advisory

Timeline

Published: Apr 2, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-34745?

How severe is CVE-2026-34745?

CVE-2026-34745 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2026-34745?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34745?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST