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Authentication Bypass by Spoofing


Severity High
Score 9.8/10


Grafana is validating Azure AD accounts based on the email claim. On Azure AD, the profile email field is not unique and can be easily modified. This leads to account takeover and authentication bypass in versions through 8.5.26, 9.0.0-beta3 through 9.2.19, 9.3.0-beta1 through 9.3.15, 9.4.0-beta1 through 9.4.12, 9.5.0 through 9.5.3, and 10.0.0-preview when Azure AD OAuth is configured with a multi-tenant app and without "allowed_groups" configured.

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

CWE-290 - Authentication Bypass by Spoofing

This attack-focused weakness is caused by improperly implemented authentication schemes that are subject to spoofing attacks.

Advisory Timeline

  • Published