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Incorrect Authorization


Severity Medium
Score 6.5/10


Mattermost versions prior to 6.2.0 fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.

  • LOW
  • NONE
  • NONE
  • LOW
  • HIGH
  • NONE

CWE-863 - Incorrect Authorization

Authorization is a security mechanism performed by an application to grant or deny access to the requested resources by verifying the privileges of the user. When an application lacks effective authorization mechanisms, it enables unauthorized users to gain unintended privileges and illegitimate access to resources. Such a vulnerability may result in exposure of sensitive information, denial of service, arbitrary code execution, and complete system takeover.

Advisory Timeline

  • Published