Worked on security hardening and reliability improvements for the CherryHQ/cherry-studio repository, focusing on backend development using JavaScript and TypeScript. Addressed a critical authentication vulnerability by implementing a solution that sanitizes authorization URLs, thereby reducing the risk of injection and phishing attacks in the authentication flow. Introduced a dedicated URL-sanitization dependency and ensured consistent use of the sanitization function across all relevant imports. This targeted bug fix enhanced the security posture of the authentication process while minimizing risk to existing functionality. The work aligned with ongoing efforts to strengthen security and maintain robust backend systems within the project’s codebase.