PT-2020-8422 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2025-12-15 · CVE-2017-18876

Positive Technologies (AI Summary)

CVSS v3.1

4.9

Medium

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/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 test for the existence of an arbitrary file.

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

Incorrect Permission

Weakness Enumeration

CWE-732

Related Identifiers

CVE-2017-18876

GHSA-HJQH-J6RJ-GH8Q

GO-2025-4187

SUSE-SU-2025:4395-1

Affected Products

Mattermost Server

References · 43

• https://osv.dev/vulnerability/CVE-2017-18876 · Vendor Advisory
• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4395-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-18876 · Security Note
• 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://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
• https://suse.com/security/cve/CVE-2018-21258 · Note