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CVE Vulnerability Details :
CVE-2026-4643
PUBLISHED
More InfoOfficial Page
Assigner-Mattermost
Assigner Org ID-9302f53e-dde5-4bf3-b2f2-a83f91ac0eee
View Known Exploited Vulnerability (KEV) details
Published At-18 May, 2026 | 08:43
Updated At-18 May, 2026 | 14:36
Rejected At-
▼CVE Numbering Authority (CNA)
Calling window.close() from server-side content causes crash in the Mattermost Desktop App

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 Products
Vendor
Mattermost, Inc.Mattermost
Product
Mattermost
Default Status
unaffected
Versions
Affected
  • From 0 through 6.0.1 (semver)
  • From 0 through 5.4.13 (semver)
Unaffected
  • 6.2.0
  • 6.1.1.0
  • 5.13.5.0
Problem Types
TypeCWE IDDescription
CWECWE-754CWE-754: Improper Check for Unusual or Exceptional Conditions
Type: CWE
CWE ID: CWE-754
Description: CWE-754: Improper Check for Unusual or Exceptional Conditions
Metrics
VersionBase scoreBase severityVector
3.13.5LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
Version: 3.1
Base score: 3.5
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Update Mattermost Desktop App to versions 6.2.0, 6.1.1.0, 5.13.5.0 or higher.

Configurations
Workarounds
Exploits
Credits
finder
Devin Binnie
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://mattermost.com/security-updates
vendor-advisory
Hyperlink: https://mattermost.com/security-updates
Resource:
vendor-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found