PT-2020-8417 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2025-12-15 · CVE-2017-18871

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Mattermost Server versions prior to 4.5.0 Mattermost Server version 4.4.5 Mattermost Server version 4.3.4 Mattermost Server version 4.2.2

Description: The issue allows attackers to cause a denial of service, resulting in an application crash, by using an @ character before a JavaScript field name.

Recommendations: For versions prior to 4.5.0, update to version 4.5.0 or later to resolve the issue. For version 4.4.5, update to version 4.5.0 or later to resolve the issue. For version 4.3.4, update to version 4.5.0 or later to resolve the issue. For version 4.2.2, update to version 4.5.0 or later to resolve the issue.

Fix

Related Identifiers

CVE-2017-18871

GHSA-JC6W-8R7F-VMP5

GO-2025-4184

SUSE-SU-2025:4395-1

Affected Products

Mattermost Server

References · 45

• https://nvd.nist.gov/vuln/detail/CVE-2017-18871 · Security Note
• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/GO-2025-4184 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2017-18871 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4395-1 · Vendor Advisory
• https://suse.com/security/cve/CVE-2017-18884 · Note
• https://suse.com/security/cve/CVE-2017-18871 · Note
• https://suse.com/security/cve/CVE-2025-12756 · Note
• https://suse.com/security/cve/CVE-2025-65025 · Note
• https://suse.com/security/cve/CVE-2025-13870 · Note
• https://suse.com/security/cve/CVE-2025-66564 · Note
• https://suse.com/security/cve/CVE-2025-61727 · Note
• https://suse.com/security/cve/CVE-2025-64443 · Note
• https://suse.com/security/cve/CVE-2025-13353 · Note
• https://suse.com/security/cve/CVE-2025-64761 · Note