PT-2020-8421 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2025-12-15 · CVE-2017-18875

Positive Technologies (AI Summary)

CVSS v3.1

4.9

Medium

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:N/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 create arbitrary files.

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

Fix

Incorrect Permission

Weakness Enumeration

CWE-732

Related Identifiers

CVE-2017-18875

GHSA-9RR5-Q43R-CCV4

GO-2025-4186

SUSE-SU-2025:4395-1

Affected Products

Mattermost Server

References · 43

• https://osv.dev/vulnerability/CVE-2017-18875 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-18875 · Security Note
• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4395-1 · Vendor Advisory
• https://suse.com/security/cve/CVE-2017-18884 · Note
• https://suse.com/security/cve/CVE-2017-18871 · Note
• https://suse.com/security/cve/CVE-2025-12756 · Note
• https://suse.com/security/cve/CVE-2025-65025 · Note
• https://suse.com/security/cve/CVE-2025-13870 · Note
• https://t.me/cibsecurity/12905 · Telegram Post
• https://suse.com/security/cve/CVE-2025-66564 · Note
• https://suse.com/security/cve/CVE-2025-61727 · Note
• https://suse.com/security/cve/CVE-2025-64443 · Note
• https://suse.com/security/cve/CVE-2025-13353 · Note
• https://suse.com/security/cve/CVE-2025-64761 · Note