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How CSRF works—and what JSF must protect
Cross-site request forgery (CSRF) abuses credentials that a browser attaches automatically, such as an authenticated session cookie. An attacker can induce a signed-in user’s browser to send a request to the application, potentially changing data or performing an administrative action. OWASP describes the attack and prevention options in its CSRF Prevention Cheat Sheet.
Start by listing every operation that changes application state: for example, profile or password changes, purchases, account administration, and actions initiated through AJAX. Apply protection at the operation or endpoint, not just to the JSF pages you can see. Include non-JSF handlers and routes called by JavaScript; a protected form does not secure a separate unprotected endpoint.
Does JSF ViewState prevent CSRF?
Not automatically. JSF ViewState is used to save and restore a view during postbacks. Depending on the implementation and configuration, state may be saved on the server or client. That role is not, by itself, proof of a universal CSRF defense: verify the documented behavior of the exact JSF implementation and release deployed by your application.
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Apache MyFaces documentation describes server- and client-side state-saving through javax.faces.STATE_SAVING_METHOD and records ViewState-related options in JSF 2.0-era releases. These are implementation-specific details, not evidence that every JSF 2.0 application or configuration is protected. The available documentation does not establish a security ranking between MyFaces and Mojarra. Check the official documentation and release notes for your actual version before relying on any built-in protection.
Implement token validation for state changes
- Inventory state-changing routes. Record each operation, its HTTP method, whether it is invoked through a JSF form, AJAX, or another handler, and where authentication is enforced.
- Keep safe methods free of side effects. Do not change application state in GET or HEAD requests. Use an appropriate state-changing method and require CSRF validation for the operation; using POST alone is not protection because an attacker can submit a forged POST form.
- Use a server-validated token. Where the framework does not supply an adequate defense, require an unpredictable token in the request and validate it on the server before performing the change. OWASP recommends this token-based approach for state-changing requests when a suitable built-in defense is unavailable.
- Cover every legitimate request path. Ensure rendered forms, AJAX calls, and any other clients that invoke protected routes carry the token. Confirm that validation runs for each route, rather than only for JSF form submissions.
- Test both acceptance and rejection. Exercise the real application flows, then submit requests without a token or with an invalid token. Verify that rejected requests produce no state change.
Using OWASP CSRFGuard in a Java application
OWASP CSRFGuard is a Java library that implements a synchronizer-token approach and offers ways to inject tokens into application HTML. It can be an option for a JSF application, but using the library does not by itself establish coverage: configure and verify token inclusion and server-side validation for every relevant form, AJAX request, and state-changing route. Check the project’s documentation for integration details that match your application.
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Use additional controls without mistaking them for tokens
- HTTPS: Protects data in transit, but does not stop a browser from sending an authenticated forged request over HTTPS.
- POST-only handling: Helps keep state changes off safe retrieval methods, but an attacker can still cause a browser to submit a forged POST.
- Referer or origin checks: Can contribute to defense in depth, but Referer validation alone has limitations. Assess the request behavior and deployment rather than treating it as a replacement for token validation.
- SameSite cookies: Can reduce exposure in suitable deployments. Evaluate the application’s domain boundaries, browser support, and endpoint behavior using current OWASP guidance; do not assume this policy covers every request path.
Keep JSF 2.0 distinct from Jakarta MVC
Jakarta MVC 2.0 defines its own CSRF API and controller features, including @CsrfProtected. Those features belong to Jakarta MVC; they are not JSF 2.0 annotations or configuration options. Do not copy Jakarta MVC configuration into a JSF application as if it enabled JSF protection.
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