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  <title>Controller method is vulnerable to CSRF - Roslyn Security Guard</title>
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        <h2>Controller method is vulnerable to CSRF</h2>
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<p>
    The annotation <code>[ValidateAntiForgeryToken]</code> is missing.
</p>

<h3>Risk</h3>

<p>
    A malicious user could send a link to the victim. By visiting the malicious link, a web page would trigger a POST request
    to the website. The victim would not be able to acknowledge that an action is made in
    the background. This attack does not require special interaction other than visiting a website.
</p>

<h3>Vulnerable Code</h3>

<pre>
public class TestController
{
    [HttpPost]
    public ActionResult ControllerMethod(string input) {
        //Do a action in the context of the logged in user
    }
}
</pre>

<h3>Solution</h3>

<pre>
public class TestController
{
    [HttpPost]
    [ValidateAntiForgeryToken] //Annotation added
    public ActionResult ControllerMethod(string input) {
        //Do something..
    }
}
</pre>

<h3>References</h3>

<p>
    <a href="https://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF)">OWASP: Cross-Site Request Forgery</a><br />
    <a href="https://www.owasp.org/index.php/Cross-Site_Request_Forgery_%28CSRF%29_Prevention_Cheat_Sheet">OWASP: CSRF Prevention Cheat Sheet</a>
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