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CVE PROGRAM SOURCE RECORD6.5 Medium

CVE-2026-3590

Race Condition in Guest Magic Link Authentication Allows Token Reuse

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to enforce atomic single-use consumption of guest magic link tokens, which allows an attacker with access to a valid magic link to establish multiple independent authenticated sessions via concurrent requests.. Mattermost Advisory ID: MMSA-2026-00624

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

  • 10.11.0 to ≤ 10.11.12affected
  • 11.5.0 to ≤ 11.5.0affected
  • 11.4.0 to ≤ 11.4.2affected
  • 11.3.0 to ≤ 11.3.2affected
  • 11.6.0unaffected
  • 10.11.13unaffected
  • 11.5.1unaffected
  • 11.4.3unaffected
  • 11.3.3unaffected

References