A flaw was found in StackRox/RHACS Central's Auth Machine-to-Machine (M2M) token exchange. When an administrator configures M2M role mappings, the system uses unanchored regular expressions for matching claim values. This allows an attacker with a valid OpenID Connect (OIDC) token, whose claim value is a superstring of a configured pattern, to gain unauthorized access to roles they were not intended to receive. This can lead to privilege escalation within the system.
Administrators should review and update their Auth Machine-to-Machine (M2M) role mappings in StackRox/RHACS Central to ensure that valueExpression regular expressions are properly anchored (e.g., by adding ^ and $ delimiters). This ensures exact matching of claim values and prevents unintended role assignments. Reloading the configuration or restarting the Central service may be required for changes to take effect.