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Permalink CVE-2026-27656
5.7 MEDIUM
  • CVSS version: 3.1
  • Attack vector (AV): NETWORK
  • Attack complexity (AC): HIGH
  • Privileges required (PR): HIGH
  • User interaction (UI): REQUIRED
  • Scope (S): UNCHANGED
  • Confidentiality impact (C): HIGH
  • Integrity impact (I): HIGH
  • Availability impact (A): NONE
created 2 weeks, 6 days ago
Account Takeover via Substring Matching in OpenID Connect Authentication

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow.. Mattermost Advisory ID: MMSA-2026-00590

References

Affected products

Mattermost
  • ==11.5.0
  • ==10.11.12
  • =<11.3.1
  • =<11.4.0
  • =<10.11.11
  • =<11.2.3
  • ==11.4.1
  • ==11.2.4
  • ==11.3.2

Matching in nixpkgs

pkgs.mattermostLatest

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle

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