PT-2020-8436 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2026-01-06 · CVE-2017-18890

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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 that allows an attacker to create a button that, when pressed by a user, launches an API request.

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

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2017-18890

GHSA-M497-HQ5X-6JCV

GO-2025-4202

SUSE-SU-2026:0037-1

Affected Products

Mattermost Server

References · 85

• 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-2017-18890 · Security Note
• https://osv.dev/vulnerability/CVE-2017-18890 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2025-4202 · 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