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Untriaged
Permalink CVE-2026-0999
5.4 MEDIUM
  • CVSS version: 3.1
  • Attack vector (AV): NETWORK
  • Attack complexity (AC): LOW
  • Privileges required (PR): LOW
  • User interaction (UI): NONE
  • Scope (S): UNCHANGED
  • Confidentiality impact (C): LOW
  • Integrity impact (I): LOW
  • Availability impact (A): NONE
created 2 months ago
Authentication bypass via userID login when email and username login are disabled

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

References

Affected products

Mattermost
  • ==11.3.0
  • ==11.1.3
  • =<11.1.2
  • ==10.11.10
  • =<10.11.9
  • ==11.2.2
  • =<11.2.1

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