| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost desktop | < 5.13.4 | 5.13.4 |
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
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