PT-2020-8420 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2026-01-06 · CVE-2017-18874

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Mattermost Server versions prior to 4.3.0 Mattermost Server version 4.2.1 Mattermost Server version 4.1.2

Description: An issue was discovered in Mattermost Server when local storage for files is used, allowing a System Admin to achieve directory traversal.

Recommendations: For versions prior to 4.3.0, update to version 4.3.0 or later. For version 4.2.1, update to version 4.3.0 or later. For version 4.1.2, update to version 4.3.0 or later.

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2017-18874

GHSA-8QG8-C7MW-6FJ7

GO-2025-4148

SUSE-SU-2026:0037-1

Affected Products

Mattermost Server

References · 82

• https://osv.dev/vulnerability/SUSE-SU-2026:0037-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2017-18874 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-18874 · Security Note
• https://mattermost.com/security-updates · Vendor Advisory
• https://suse.com/security/cve/CVE-2017-18889 · Note
• https://suse.com/security/cve/CVE-2025-0426 · Note
• https://suse.com/security/cve/CVE-2025-68938 · Note
• https://suse.com/security/cve/CVE-2017-18886 · Note
• https://suse.com/security/cve/CVE-2025-34430 · Note
• https://suse.com/security/cve/CVE-2025-62190 · Note
• https://suse.com/security/cve/CVE-2024-41260 · Note
• https://suse.com/security/cve/CVE-2025-47913 · Note
• https://suse.com/security/cve/CVE-2017-18888 · Note
• https://suse.com/security/cve/CVE-2025-13352 · Note
• https://suse.com/security/cve/CVE-2025-67818 · Note