PT-2020-8447 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2026-01-17 · CVE-2017-18901

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 4.1.0 Mattermost Server version 4.0.4 and earlier Mattermost Server version 3.10.3 and earlier

Description: An issue allows attackers to discover a team invite ID by requesting a JSON document.

Recommendations: For versions prior to 4.1.0, update to version 4.1.0 or later. For version 4.0.4 and earlier, update to version 4.0.5 or later, or apply the fix from version 4.1.0. For version 3.10.3 and earlier, update to version 3.10.4 or later, or apply the fix from version 4.1.0.

Fix

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

CVE-2017-18901

GHSA-C253-8HR4-R8V9

GO-2026-4304

SUSE-SU-2026:0142-1

Affected Products

Mattermost Server

References · 43

• https://osv.dev/vulnerability/GHSA-c253-8hr4-r8v9 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2017-18901 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-18901 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:0142-1 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4304 · Vendor Advisory
• https://mattermost.com/security-updates · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://github.com/mattermost/mattermost/commit/a78ed923f1c73ae5551893374fb9803ee2f4c8e6 · Note
• https://github.com/mattermost/mattermost/commit/5e822a7d09214d5446d54e02a0611df8e64f3aa5 · Note
• https://github.com/mattermost/mattermost/commit/638c38cc0d2296335a0fbd5bde8b6d2cbf9f9062 · 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://suse.com/security/cve/CVE-2026-22703 · Note
• https://suse.com/security/cve/CVE-2025-68954 · Note