CVE-2026-33645 Details
Description
Fireshare facilitates self-hosted media and link sharing. In version 1.5.1, an authenticated path traversal vulnerability in Fireshare’s chunked upload endpoint allows an attacker to write arbitrary files outside the intended upload directory. The `checkSum` multipart field is used directly in filesystem path construction without sanitization or containment checks. This enables unauthorized file writes to attacker-chosen paths writable by the Fireshare process (e.g., container `/tmp`), violating integrity and potentially enabling follow-on attacks depending on deployment. Version 1.5.2 fixes the issue.
A path traversal vulnerability has been identified in Fireshare version 1.5.1, specifically within the chunked upload endpoint. This vulnerability allows authenticated attackers to write arbitrary files outside the designated upload directory. The issue arises because the 'checkSum' multipart field is used to construct filesystem paths without proper sanitization or containment checks. As a result, attackers can exploit this flaw to write files to locations writable by the Fireshare process, such as the '/tmp' directory in containerized environments. This violation of data integrity could lead to further attacks, depending on the specific deployment.
Users can upgrade to Fireshare version 1.5.2, which addresses this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 27, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-7q8r-vpq3-89m7 | CISA-ADP | Vendor Advisory |
| https://github.com/ShaneIsrael/fireshare/releases/tag/v1.5.2 | [email protected] | Release Notes |
| https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-7q8r-vpq3-89m7 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
| CWE-73 | External Control of File Name or Path | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| shaneisrael fireshare | 1.5.1 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 30, 2026 | Initial Analysis | [email protected] |
| Mar 27, 2026 | CVE Modified | CISA-ADP |
| Mar 26, 2026 | New CVE Received | [email protected] |