CVE-2026-4643
Calling window.close() from server-side content causes crash in the Mattermost Desktop App
CVSS Score
3.5
EPSS Score
0.0%
EPSS Percentile
0th
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
| CWE | CWE-754 |
| Vendor | mattermost |
| Product | mattermost |
| Published | May 18, 2026 |
Stay Ahead of the Next One
Get instant alerts for mattermost mattermost
Be the first to know when new low vulnerabilities affecting mattermost mattermost are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
Mattermost / Mattermost
0 ≤ 6.0.1 0 ≤ 5.4.13
Credits
Devin Binnie