Content Security Policy (CSP)

Content Security Policy (CSP) is a security measure that helps protect web applications from various attacks, including Cross-Site Scripting (XSS) and data injection. CSP works by specifying a set of Content Security Rules that dictate what resources are allowed to load on a page. This can be used to whitelist trusted sources of content, or to block untrusted content entirely.

One advantage of Content Security Policy is that it can help to prevent malicious code from running on a page. This is because CSP blocks resources from loading unless they are explicitly allowed by the Content Security Rules. As a result, CSP can act as a barrier against XSS attacks and other types of malicious code injection.

However, Content Security Policy can also have some disadvantages. One issue is that CSP can sometimes break legitimate functionality on a page. For example, if a resource is blocked by CSP, it may prevent an image from loading or prevent a form from being submitted. Another potential drawback is that CSP requires careful planning and implementation in order to be effective. If Content Security Rules are not configured correctly, it may be possible for attackers to bypass them entirely.

Overall, Content Security Policy is a very valuable tool for improving web security. However, it is important to weigh the advantages and disadvantages carefully before deciding whether or not to implement CSP on a particular site.

Carl Sampson avatar
I am an application security guy living in Indiana. I also started and lead the OWASP Indianapolis Chapter.
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