Apache James SASL OAuthBearer/XOAUTH2 prior versions 3.9.1 fails to validate correctly AUD claim of JWT payloads when introspection is not configured.
This allows an attacker with valid credentials to access the mail server even if they are not authorized to do so.
We recommend users to upgrade to non vulnerable version that forces explicit configuration of aud claims and forces introspection.
Insufficient Verification of Data Authenticity The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.