PT-2020-8464 · Mattermost · Mattermost Server

CVE-2017-18918 · Published 2020-06-19 · Updated 2026-03-03

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 3.7.3 Mattermost Server versions prior to 3.6.5

Description: An issue was discovered in Mattermost Server. A System Administrator can place a SAML certificate at an arbitrary pathname.

Recommendations: For versions prior to 3.7.3, update to version 3.7.3 or later. For versions prior to 3.6.5, update to version 3.6.5 or later.

Fix

Improper Certificate Validation

Path traversal

Weakness Enumeration

CWE-295

CWE-22

Related Identifiers

CVE-2017-18918

GHSA-5GHQ-28R7-QWFJ

GO-2026-4460

SUSE-SU-2026:0757-1

Affected Products

Mattermost Server

References · 116

• https://osv.dev/vulnerability/GHSA-5ghq-28r7-qwfj · Vendor Advisory
• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2017-18918 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-18918 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:0757-1 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4460 · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://github.com/mattermost/mattermost/commit/a12e7fdca439948ab097431d68e8f59778fbab81 · Note
• https://github.com/mattermost/mattermost/commit/8ec37570742b67fd640bb3434ea226c655dbf408 · Note
• https://suse.com/security/cve/CVE-2026-27590 · Note
• https://suse.com/security/cve/CVE-2026-25120 · Note
• https://suse.com/security/cve/CVE-2026-26190 · Note
• https://suse.com/security/cve/CVE-2026-27017 · Note
• https://suse.com/security/cve/CVE-2026-23991 · Note
• https://suse.com/security/cve/CVE-2026-24834 · Note