CVE-2026-1628
Mattermost allows external websites to open within the app, exposing preload functionality to non-trusted sites.
- State
- Published
- Severity
- 4.6 Medium
- Published
- Mar 2, 2026
- Updated
- Mar 2, 2026
- Reserved
- Jan 29, 2026
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
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.6 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N | Mattermost |
Weaknesses
- CWE-829 Inclusion of Functionality from Untrusted Control Sphere
Affected Products
| Product | Versions |
|---|---|
MattermostMattermost |
|
References
- MMSA-2026-00596vendor-advisory
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