fix: validate returnTo parameter to prevent open redirect #46
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Add URL validation for the returnTo parameter in OIDC authentication flow to prevent open redirect vulnerabilities. - Add isValidReturnToUrl() helper function to validate URLs - Validate returnTo at input point (when storing in session) - Validate returnTo at output points (before redirects) - Reject external URLs with BadRequestError - Use safe fallback for invalid URLs at redirect points Fixes jetkvm#7
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Add URL validation for the returnTo parameter in OIDC authentication flow to prevent open redirect vulnerabilities.
Fixes #7