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Untriaged
Permalink CVE-2026-1628
4.6 MEDIUM
  • CVSS version: 3.1
  • Attack vector (AV): NETWORK
  • Attack complexity (AC): LOW
  • Privileges required (PR): LOW
  • User interaction (UI): REQUIRED
  • Scope (S): UNCHANGED
  • Confidentiality impact (C): LOW
  • Integrity impact (I): LOW
  • Availability impact (A): NONE
created 1 month, 2 weeks ago
Mattermost allows external websites to open within the app, exposing preload functionality to non-trusted sites.

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

References

Affected products

Mattermost
  • ==5.13.4.0
  • =<5.13.3

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pkgs.mattermostLatest

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle

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