CVE-2026-4643CWE-754

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

Low · published May 18, 2026

CVSS v3.1
3.5
EPSS
0%
Percentile
20.0
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
3.5 · LOW
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00288 · 20.0th percentile
Weakness
CWE-754 · Improper Check for Unusual or Exceptional Conditions
Published
2026-05-18T08:43Z
EPSS history
Timeline
  • 18 MAY 08:43Z
    Calling window.close() from server-side content causes crash in the Mattermost Desktop App
    cvelistv5