default-src 'none'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; img-src 'self' data:; style-src 'self' 'unsafe-inline' 'unsafe-eval'; connect-src 'self'; font-src 'self'; frame-ancestors 'none'; This solution works well with ASP.NET WebForms as it still allows inline (no need to extract everything to separate js files) as well as eval's. Here's how one might use it with the CSP script-src directive: script-src 'nonce-rAnd0m'; NOTE: We are using the phrase: rAnd0m to denote a random value. Configuring a CSP involves adding the Content By injecting the Content-Security-Policy (CSP) headers from the server, the browser is aware and capable of protecting the user from dynamic calls that will load content into the page currently being visited. content security policy: the pages settings blocked the loading of a resource at inline (default-src). The unsafe-inline keyword annuls most of the security benefits that Content-Security-Policy provide.. Let's imagine that you have an app that simply output's a name from the query string variable name, eg: Hello The use of 'unsafe-inline' is discouraged. # Cross-site scripting (XSS)the ability to inject malicious scripts into a web applicationhas been one of the biggest web security vulnerabilities for over a decade. Theres a number of free tools that can assist with the generating, evaluation and monitoring of content security policy. When present, the use of inline script and eval() is blocked without the addition of Unsafe Inline and Unsafe Eval respectively. You can add unsafe-inline CSP policy to allow all inline styles and scripts. Warning. These protections are largely unnecessary in modern browsers when sites implement a strong Content-Security-Policy that disables the use of inline JavaScript ('unsafe-inline'). A CSP helps protect against XSS attacks by informing the browser of valid: Sources for loaded content, including scripts, stylesheets, and images. Banning inline script is the biggest security win CSP provides, and banning inline style likewise hardens your application. You should rely on CSP checkers like CSP Evaluator instead.. options.directives is an object. See MDN's introductory article on Content Security Policy.. script-src 'unsafe-inline' Allows use of inline source elements such as style attribute, onclick, or script tag bodies (depends on the context of the source it is applied to) and javascript: URIs 'unsafe-eval' script-src 'unsafe-eval' This article brings forth a way to integrate the defense in depth concept to the client-side of web applications. Good default declaration: * gap: is required only on iOS (when using UIWebView) and is needed for JS->native communication * https://ssl.gstatic.com is required only on Android and is needed for TalkBack to function properly * Disables use of eval() and inline scripts in order to mitigate risk of XSS vulnerabilities. This means that IE11 will simply ignore the policy Except for one very specific case, you should avoid using the unsafe-inline keyword in your CSP policy. This results in a default CSP of script-src * 'unsafe-inline' 'unsafe-eval'; worker-src 'self' blob:; style-src * 'unsafe-inline'; font-src * data:; frame-ancestors 'self';.In our roadmap, we have the ability to modify currently non-customizable headers. The OWASP Secure Headers Project intends to raise awareness and use of These types of manipulations can be prevented by disallowing JavaScript via the script-src CSP directive if you absolutely have to use it, there are a few mechanisms that will allow them. Content Security Policy Reference. . This directive falls back to script-src (which in turn falls back to default-src) if not specified. Asking for help, clarification, or responding to other answers. Content Security Policy Cheat Sheet Introduction. Electron Node.js Introduction. Please be sure to answer the question.Provide details and share your research! The HTTP Content-Security-Policy (CSP) style-src directive specifies valid sources for stylesheets. As you might guess it is generally unsafe to use unsafe-inline.. Content Security Policy (CSP) is an added layer of security that helps to mitigate XSS. CSP: script-src-attr; CSP: script-src-elem; CSP: style-src; CSP: style-src-attr; but doesn't allow 'unsafe-eval' or 'unsafe-inline' for example. The script-src-elem directive specifies valid sources for JavaScript in script elements (script requests, script blocks). Each directive completely overwrites the default for that specific type of resource. This middleware performs very little validation. Content-Security-Policy: script-src 'nonce-{SERVER-GENERATED-NONCE}'; img-src www.googletagmanager.com it is possible to enable the Tag Manager inline script by adding the 'unsafe-inline' directive to the CSP's script-src section. If this directive is absent, the user agent will use the value in the element. But avoid . HTTP Content-Security-Policy Each key is a directive name in HTTP Content-Security-Policy Cross-Site ScriptXSS (en-US) 'unsafe-inline' Allows the use of inline resources, such as inline