CVE-2026-4643

LOW

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

Title source: cna
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory
MMSA-2026-00633
https://mattermost.com/security-updates

Scores

CVSS v3 3.5
EPSS 0.0003
EPSS Percentile 10.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-754
Status published
Products (5)
Mattermost/Mattermost < 5.4.13
Mattermost/Mattermost < 6.0.1
Mattermost/Mattermost 5.13.5.0
Mattermost/Mattermost 6.1.1.0
Mattermost/Mattermost 6.2.0
Published May 18, 2026
Tracked Since May 18, 2026