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

CVE-2026-4643

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

Description (CNA)

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

Affected (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 0 through 6.0.1; affected 0 through 5.4.13; unaffected 6.2.0; unaffected 6.1.1.0; unaffected 5.13.5.0

CWE

CWE-754

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.