To address CSRF issues in applications, here's the complete range of solutions:
1. **Use CSRF Tokens**: Implement per-request or session-based CSRF tokens with sufficient entropy, and validate them on the server side.
2. **Enable `confirmationTokenRequired`**: For Visualforce pages, set the `confirmationTokenRequired` attribute to "true" to enforce token validation.
3. **Add User Interaction**: Require explicit user actions, like button clicks, before initiating state changes or DML operations. Avoid triggering such operations on page load.
4. **Avoid DML in Constructors or `init` Methods**: Refrain from performing database operations in methods automatically invoked during page initialization.
5. **Validate Redirections**: Use authentication tokens to ensure redirections are valid and secure.
6. **Eliminate Remote Site References**: Remove unnecessary remote site references from packaged code to reduce vulnerabilities.
7. **Follow Secure Coding Practices**: Adhere to secure coding guidelines, such as those in Salesforce's security review documentation, to prevent CSRF and other vulnerabilities.
8. **Conduct Thorough Testing**: Use tools like Checkmarx or CodeAnalyzer to identify and address potential CSRF risks across the application.
Applying these measures consistently will help mitigate CSRF vulnerabilities effectively.