PT-2026-28505 · Fireshare · Fireshare

Qiaonpc · Published 2026-03-26 · Updated 2026-04-03 · CVE-2026-33645

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Fireshare versions prior to 1.5.2

Description Fireshare facilitates self-hosted media and link sharing. Version 1.5.1 contains an authenticated path traversal vulnerability in the chunked upload endpoint. The checkSum multipart field is used directly in filesystem path construction without sanitization or containment checks. This allows an attacker to write arbitrary files to attacker-chosen paths writable by the Fireshare process, such as the /tmp container, potentially enabling follow-on attacks depending on deployment. This compromises the integrity of the system.

Recommendations Update to version 1.5.2 or later.

Exploit

Fix

Path traversal

Weakness Enumeration

CWE-22

CWE-73

Related Identifiers

CVE-2026-33645

GHSA-7Q8R-VPQ3-89M7

Affected Products

Fireshare

References · 8

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33645.json · Exploit
• 🔥 https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-7q8r-vpq3-89m7 · Exploit
• https://osv.dev/vulnerability/CVE-2026-33645 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33645 · Security Note
• https://github.com/ShaneIsrael/fireshare/releases/tag/v1.5.2 · Note
• https://twitter.com/CVEnew/status/2037280523538825544 · Twitter Post
• https://twitter.com/CVEnew/status/2040128783626166738 · Twitter Post
• https://twitter.com/TheHackerWire/status/2039915838241914909 · Twitter Post