Validate and sanitize all user inputs on the server side to ensure they adhere to expected formats. Use output encoding functions to sanitize data before rendering it in HTML or other contexts.
Implement a CSP to control which resources can be loaded on your web pages. This can mitigate the impact of XSS attacks by restricting the execution of unauthorized scripts.
Employ secure communication channels by using HTTPS to encrypt data in transit. This helps prevent attackers from intercepting and injecting malicious scripts into the communication.
Keep web application frameworks, libraries, and server software up t o date with the latest security patches. This helps address known vulnerabilities and reduces the risk of exploitation.