PT-2020-8441 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2026-01-17 · CVE-2017-18895

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Mattermost Server versions prior to 4.2.0 Mattermost Server version 4.1.1 Mattermost Server version 4.0.5

Description: An issue allows attackers to obtain sensitive information, specifically user statuses, via a REST API version 4 endpoint.

Recommendations: For Mattermost Server versions prior to 4.2.0, update to version 4.2.0 or later. For Mattermost Server version 4.1.1, update to version 4.2.0 or later. For Mattermost Server version 4.0.5, update to version 4.2.0 or later.

Fix

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

CVE-2017-18895

GHSA-H742-XX59-R9PQ

GO-2026-4295

SUSE-SU-2026:0142-1

Affected Products

Mattermost Server

References · 45

• https://osv.dev/vulnerability/GHSA-h742-xx59-r9pq · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-18895 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:0142-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2017-18895 · Vendor Advisory
• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4295 · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://github.com/mattermost/mattermost/commit/d38328976e2c8bb0fab91e656042a0d8ac37bc76 · Note
• https://github.com/mattermost/mattermost/commit/722fb1947a2e7395ccf16adce9206736d803a9f3 · Note
• https://github.com/mattermost/mattermost/commit/3c34e2b2dcb0fde96a10e68d877aa7d0ab511669 · Note
• https://suse.com/security/cve/CVE-2026-22688 · Note
• https://suse.com/security/cve/CVE-2026-21859 · Note
• https://suse.com/support/update/announcement/2026/suse-su-20260142-1 · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18895 · Note
• https://suse.com/security/cve/CVE-2026-22703 · Note