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CVE-2026-0999

MediumCVSS 4.3/10Last modified Jun 17, 2026

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

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

Affected software

No affected versions have been published.

Timeline

Published: Feb 16, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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CVE-2026-0999: Medium severity, CVSS 4.3 | Vulnix