CVE-2026-0998 MEDIUM

CVE-2026-0998: Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insufficient API access controls

Vendor Mattermost
Product Mattermost
Weakness CWE-862 · Missing authorization
Published February 16, 2026
Last update February 17, 2026
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

February 16, 2026 CVE published
February 17, 2026 Record updated