CVE-2026-34745
Unauthenticated Path Traversal Arbitrary File Write in /api/uploadChunked/public
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.
INFO
Published Date :
April 2, 2026, 7:21 p.m.
Last Modified :
July 24, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Fireshare to version 1.5.3 or later.
- Apply the vendor-provided patch.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34745.
| URL | Resource |
|---|---|
| https://github.com/ShaneIsrael/fireshare/commit/b76915607924756e6fa1a5f6c8823c38d611fb24 | Patch |
| https://github.com/ShaneIsrael/fireshare/pull/520 | Issue Tracking Patch |
| https://github.com/ShaneIsrael/fireshare/releases/tag/v1.5.3 | Release Notes |
| https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-fvvp-rj8g-c7gc | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34745 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34745
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34745 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34745 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Added Translation Title: fireshare de ShaneIsrael, Description: Fireshare facilita el intercambio de medios y enlaces autoalojados. Antes de la versión 1.5.3, la corrección para CVE-2026-33645 se aplicó al endpoint autenticado /API/uploadChunked pero no se aplicó al endpoint no autenticado /API/uploadChunked/public en el mismo archivo (app/server/fireshare/api.py). Un atacante no autenticado puede explotar el parámetro checkSum para escribir archivos arbitrarios con contenido controlado por el atacante en cualquier ruta escribible en el sistema de archivos del servidor. Este problema ha sido parcheado en la versión 1.5.3. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'ShaneIsrael', 'product': 'fireshare', 'versions': [{'status': 'affected', 'version': '< 1.5.3'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-34745', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-04-02T19:15:35.516472Z'} -
Initial Analysis by [email protected]
Apr. 03, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:shaneisrael:fireshare:*:*:*:*:*:*:*:* versions up to (excluding) 1.5.3 Added Reference Type GitHub, Inc.: https://github.com/ShaneIsrael/fireshare/commit/b76915607924756e6fa1a5f6c8823c38d611fb24 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/ShaneIsrael/fireshare/pull/520 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/ShaneIsrael/fireshare/releases/tag/v1.5.3 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-fvvp-rj8g-c7gc Types: Exploit, Mitigation, Vendor Advisory -
New CVE Received by [email protected]
Apr. 02, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Added CWE CWE-22 Added Reference https://github.com/ShaneIsrael/fireshare/commit/b76915607924756e6fa1a5f6c8823c38d611fb24 Added Reference https://github.com/ShaneIsrael/fireshare/pull/520 Added Reference https://github.com/ShaneIsrael/fireshare/releases/tag/v1.5.3 Added Reference https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-fvvp-rj8g-c7gc