PT-2020-8424 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2026-01-06 · CVE-2017-18878

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

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 where knowledge of a session ID allows revoking another user's session.

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-2017-18878

GHSA-H564-6GC2-FCC6

GO-2025-4191

SUSE-SU-2026:0037-1

Affected Products

Mattermost Server

References · 82

• https://osv.dev/vulnerability/SUSE-SU-2026:0037-1 · Vendor Advisory
• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-18878 · Security Note
• https://osv.dev/vulnerability/CVE-2017-18878 · 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