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CVE PROGRAM SOURCE RECORD4.6 Medium

CVE-2026-1628

Mattermost allows external websites to open within the app, exposing preload functionality to non-trusted sites.

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Mattermost app which allows a malicious server to expose preload script functionality to untrusted servers via having a user open an external link in their Mattermost server. Mattermost Advisory ID: MMSA-2026-00596

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 ≤ 5.13.3affected
  • 5.13.4.0unaffected

References