Vulnerability · Published Feb 16, 2026 · Assigned by Mattermost
CVE-2026-0998Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insufficient API access controls
Medium 4.3
In plain English
A medium-severity missing authorization in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-plugin-zoom | 1.12.0 | GHSA-w65c-fvp5-fvc5 |
| Go | github.com/mattermost/mattermost-plugin-zoom | 1.12.0 | GO-2026-4525 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 11.1.0 – through 11.1.210.11.0 – through 10.11.911.2.0 – through 11.2.1 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
References
- MMSA-2025-00534 vendor-advisory