![]() The vast majority of modern browsers support all or nearly all Level 2 directives, and this article describes CSP Level 2 as the de facto current standard.ĬSP implementations have used 3 different content security policy header names, depending on the browser and time of adoption: While only a recommendation, CSP was quickly implemented by browser vendors, starting with Firefox 4. Version 1 (or Level 1) was proposed in 2012, with Level 2 following in 2014, and Level 3 in development since 2015 as a draft recommendation. History and Browser SupportĬontent Security Policy is a candidate recommendation of the W3C working group on web application security. By default, CSP also enforces modern script coding styles for extra security. ![]() Using carefully defined policies, you can restrict browser content to eliminate many common injection vectors and significantly reduce the risk of XSS attacks. Without additional safety measures, the browser executes all code from a trusted origin and can’t tell which code is legitimate, so any injected malicious code is executed as well.Įnter Content Security Policy (CSP) – a standardized set of directives that tell the browser what content sources can be trusted and which should be blocked. In theory, this should be enough to ensure security, but the modern web requires sites to include lots of assets from external sources, such as scripts and other resources from content delivery networks (CDNs), Google Analytics scripts, fonts, styles, comment modules, social media buttons – the list goes on.Īt the same time, malicious hackers use cross-site scripting (XSS) attacks to trick websites trusted by the user into delivering malicious code. Web security is based on same-origin policy (SOP), which prevents a website from accessing data outside its own origin. This article shows how to use CSP headers to protect websites against XSS attacks and other attempts to bypass same-origin policy. By using suitable CSP directives in HTTP response headers, you can selectively specify which data sources should be permitted in your web application. Content Security Policy (CSP) is a computer security standard that provides an added layer of protection against Cross-Site Scripting (XSS), clickjacking, and other code injection attacks that rely on executing malicious content in the context of a trusted web page.
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