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CVE PROGRAM SOURCE RECORD5.4 Medium

CVE-2026-9597

Deactivated guest accounts can authenticate via magic-link token in Mattermost REST API login endpoint

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation.. Mattermost Advisory ID: MMSA-2026-00681

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

  • 11.7.0 to ≤ 11.7.2affected
  • 11.6.0 to ≤ 11.6.4affected
  • 11.8.0unaffected
  • 11.7.3unaffected
  • 11.6.5unaffected

References