CVE-2026-0999

Published Feb 16, 2026

Last updated 14 days ago

Overview

Description
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate login method restrictions which allows an authenticated user to bypass SSO-only login requirements via userID-based authentication. Mattermost Advisory ID: MMSA-2025-00548
Source
responsibledisclosure@mattermost.com
NVD status
Analyzed
Products
mattermost_server

Risk scores

CVSS 3.1

Type
Primary
Base score
4.3
Impact score
1.4
Exploitability score
2.8
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Severity
MEDIUM

Weaknesses

responsibledisclosure@mattermost.com
CWE-303

Social media

Hype score
Not currently trending

Configurations

References

Sources include official advisories and independent security research.