CVE-2026-0998

MEDIUM

Mattermost 11.1.x-11.1.2 - Auth Bypass

Title source: llm
STIX 2.1

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

References (1)

Core 1
Core References
Various Sources vendor-advisory
https://mattermost.com/security-updates

Scores

CVSS v3 4.3
EPSS 0.0004
EPSS Percentile 12.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-862
Status published
Products (3)
mattermost/mattermost-plugin-zoom 0 - 1.12.0Go
mattermost/mattermost_server 10.11.0 - 10.11.10
mattermost/zoom < 1.11.0
Published Feb 16, 2026
Tracked Since Feb 18, 2026