Cloudanix VulnDB

CVE-2026-0999

Medium · 5.4

CVSS

5.4

EPSS

0.2%

Published

Feb 16, 2026

CISA due date

—

The record

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

Affected packages

Ecosystem Package Introduced Fixed
Go github.com/mattermost/mattermost-server 0 No fix
Go github.com/mattermost/mattermost-server 10.11.0+incompatible No fix
Go github.com/mattermost/mattermost-server 11.1.0+incompatible No fix
Go github.com/mattermost/mattermost-server 11.2.0+incompatible No fix
Go github.com/mattermost/mattermost-server/v5 0 No fix
Go github.com/mattermost/mattermost-server/v6 0 No fix
Go github.com/mattermost/mattermost/server/v8 0 8.0.0-20251212052346-61651b0df7ea
openSUSE:Leap 15.6 govulncheck-vulndb 0 0.0.20260226T182644-150000.1.149.1

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