PT-2026-41654 · Mattermost · Mattermost Desktop App

Devin Binnie · Published 2026-05-18 · Updated 2026-05-18 · CVE-2026-4643

Positive Technologies (AI Summary)

CVSS v3.1

3.5

Low

Base vector

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

Name of the Vulnerable Software and Affected Versions Mattermost Desktop App versions prior to 6.2

Description The application fails to prevent server-rendered content from closing an underlying application view. This allows a malicious server or plugin to crash the desktop client by invoking the window.close() function in the renderer context, resulting in a denial of service condition at the client level.

Recommendations Update to a version newer than 6.1.

Fix

DoS

Improper Check for Exceptional Conditions

Weakness Enumeration

CWE-754

Related Identifiers

CVE-2026-4643

Affected Products

Mattermost Desktop App

References · 5

• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4643 · Security Note
• https://twitter.com/CVEarity/status/2056409481547042947 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2056345910632669333 · Twitter Post
• https://t.me/CVEtracker/54114 · Telegram Post