Worked on security hardening for user attribute management in the goauthentik/authentik repository, focusing on backend improvements using Python and Django. Addressed a bug where user attributes could be updated unsafely by introducing a sanitization function that ensures only validated data is written. Refined the update logic to restrict attribute changes to controlled pathways, reducing the risk of unsafe writes and maintaining compliance with attribute policies. Developed and integrated automated regression tests to ensure ongoing data integrity and prevent future vulnerabilities. This work strengthened the backend’s handling of user data, emphasizing robust API development and secure update mechanisms throughout the codebase.