nodece opened a new pull request #9172:
URL: https://github.com/apache/pulsar/pull/9172


   Signed-off-by: Zixuan Liu <[email protected]>
   
   ### Motivation
   
   If Apache Pulsar is configured to authenticate clients using tokens based on 
JSON Web Tokens (JWT), the signature of the token is not validated if the 
algorithm of the presented token is set to "none". This allows an attacker to 
connect to Pulsar instances as any user (incl. admins).
   
   ### Modifications
   
   - Disallow parsing of token with none signature in authenticateToken 
   
   ### Verifying this change
   
   - [ ] Make sure that the change passes the CI checks.
   


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