CVE-2026-0998
Medium
Description
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint which allows unauthorized users to start Zoom meetings as any user and overwrite arbitrary posts via direct API calls with manipulated user IDs and post data.. Mattermost Advisory ID: MMSA-2025-00534
SeverityMedium
CVSS4.3
Exploit probability—
Product
Mattermost Server
PublishedFeb 16, 2026
First seenFeb 16, 2026
Weakness typeCWE-862Missing authorization
How to fix
Update
- mattermost mattermost_server10.11.10, 11.1.3, 11.2.2 or later
- github.com/mattermost/mattermost-plugin-zoom1.12.0 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.11.0 ≤ v < 10.11.10, 11.1.0 ≤ v < 11.1.3, 11.2.0 ≤ v < 11.2.2 | 10.11.10, 11.1.3, 11.2.2 |
| mattermost zoom | v ≤ 1.11.0 | — |
| github.com/mattermost/mattermost-plugin-zoomGo | v < 1.12.0 | 1.12.0 |
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