CVE-2026-4643 LOW

CVE-2026-4643: Calling window.close() from server-side content causes crash in the Mattermost Desktop App

Vendor Mattermost
Product Mattermost
Weakness CWE-754
Published May 18, 2026
Last update May 18, 2026
View on NVD All CVEs

CVSS base score

3.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L

What the vulnerability does

01Description

Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying application view in the Mattermost Desktop App which allows a malicious server or plugin to crash the desktop client via invoking {{window.close()}} in the renderer context, leading to a denial of service condition at the client level. Mattermost Advisory ID: MMSA-2026-00633

Key dates

02Disclosure timeline

May 18, 2026 CVE published
May 18, 2026 Record updated