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CVE PROGRAM SOURCE RECORD5.4 Medium

CVE-2026-0999

Authentication bypass via userID login when email and username login are disabled

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Status
Published
Published
Updated
Assigning organization
Mattermost

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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mattermost Mattermost

Default version status: unaffected

  • 11.1.0 to ≤ 11.1.2affected
  • 10.11.0 to ≤ 10.11.9affected
  • 11.2.0 to ≤ 11.2.1affected
  • 11.3.0unaffected
  • 11.1.3unaffected
  • 10.11.10unaffected
  • 11.2.2unaffected

References