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CVE PROGRAM SOURCE RECORD6.5 Medium

CVE-2026-3471

Opening a window with {{javascript:alert()}} as URL causes crash in the Mattermost Desktop App

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent an invalid URL from loading in a pop-up window in the Mattermost Desktop App which allows a malicious server owner to repeated crash the application via calling {{window.open('javascript:alert()');}}. Mattermost Advisory ID: MMSA-2026-00618

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mattermost Mattermost

Default version status: unaffected

  • 0 to ≤ 6.0.1affected
  • 0 to ≤ 5.4.13affected
  • 6.2.0unaffected
  • 6.1.1.0unaffected
  • 5.13.5.0unaffected

References