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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

PUBLISHED Reserved 2026-03-23 | Published 2026-05-18 | Updated 2026-05-18 | Assigner Mattermost




LOW: 3.5CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L

Problem types

CWE-754: Improper Check for Unusual or Exceptional Conditions

Product status

Default status
unaffected

Any version
affected

Any version
affected

6.2.0
unaffected

6.1.1.0
unaffected

5.13.5.0
unaffected

Credits

Devin Binnie finder

References

mattermost.com/security-updates (MMSA-2026-00633) vendor-advisory

cve.org (CVE-2026-4643)

nvd.nist.gov (CVE-2026-4643)

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