Webpack csp unsafe eval. 1 或更高版本 如果暂时无法升级，可以在开发环境中临时添加 'unsafe-eval' 到 CSP 策略中 检查项目中其他可能依赖动态代码执行的库或代码 最佳实践建议 在开发环境中， Now, if you allow unsafe-eval, then that eval becomes a point of entry for the attacker, and once they manage to inject their javascript into your app, they have total control and all other Something about the Webpack config used for Vue 3 has introduced code that executes 'unsafe-eval' in the browser, though only in development mode. Key point is in: because it violates the following Content Security Policy directive: "default-src 'self' 'unsafe-inline' data:" Note that 'font-src' was not explicitly set / Note that 'style-src CSP makes cross-site attacks much more difficult. 0, this worked fine without the 'unsafe-eval' script-src permission, but now it requires it. Second, the issue of eval comes even after defining alias to runtime because webpack itself uses eval method in try catch block. Most CSP directives are supported and certified within the JavaScript Maps SDK. add CSP restrictions and not enable the unsafe-eval in your head tag. Alternatives Uncaught EvalError: Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "script-src 'self' Notice one thing we did not include anywhere in our CSP is the ‘ unsafe-eval ’ keyword. References & further reading Cloudflare - What is Cross-Site Scripting? MDN - Content-Security-Policy MDN - Cross-Site Scripting Errors lang. The CSP is This is an excerpt from README in my private repository. I'm opening this issue for if/when someone has the I encountered an issue when deploying a Next. I am closing this issue since it's not a problem with single My sincerest apologies for assuming the unsafe-eval issue was an issue with vue-i18n v8 I was a little misled by a few stack overflow posts and Allow 'unsafe-eval' in CSP is not a solution we could afford as it reduces the CSP purpose ! The only solution I've found so far is to : tell 如何通过webpack配置移除eval的使用？ 怎样避免在webpack构建中使用函数构造函数？ webpack构建中如何应对CSP问题？ 问题出在在编译的代码中使用eval的Webpack。 因 Webpack 4 build bricks CSP with unsafe-eval Ask Question Asked 7 years, 1 month ago Modified 1 year, 6 months ago We’ve tried to upload Angular project created from scratch to Add-on validator. unsafe-eval は主に CSP という仕組みの設定と関係しており、script-src という指示の中で「このサイトがどのソースからコードを実行してよいか」を決める基準になります。 JavaScript には eval という関数があり、文字列をそのままプログラムとして実行します。 unsafe-eval はこのような評価機能を利用可能にするかを決める キーワード です。 CSP（Content Security Policy）というセキュリティの仕組みの中で、unsafe-eval を許可すると外部から渡された文字列がそのままコードとして実行されてしまう危険性が高まります。 If you’ve ever built a Chrome Extension using Webpack, you’ve likely encountered the dreaded unsafe-eval error. ts を以下のよ I'm opening this as a discussion first to get input as this could either be a bug or documentation issue with webpack-dev-server. Learn about CSP in React and how it helps prevent XSS. Header set Content-Security-Policy "default-src 'none'; font-src 'self' data:; style-src 'self' 'unsafe-inline' data:; img-src 'self' data:; script-src 'self' 'unsafe-inline'; Calling Function or eval should be eliminated as a security measure and would cause the application execution to be halted if the document CSP CSDN问答为您找到为什么会出现“Refused to evaluate a string as JavaScript because 'unsafe-eval' is not allowed”错误？相关问题答案，如果想了解更多关于为什么会出现“Refused to do we need to use __webpack_nonce__ ?, reference Research about React and CSP, Done: we are fine with default config, reference Research about Angular and CSP, Done: Added ArthurClemens mentioned this on Oct 28, 2018 CSP violation with 'unsafe-eval' bpampuch/pdfmake#1360 nicksellen mentioned this on Nov 23, A plugin which, when combined with HTMLWebpackPlugin, adds CSP tags to the HTML output. js minimal application to replicate unsafe-eval csp issue. script-src, unsafe-eval in CSP and editors karthik7700 (@karthik7700) 2 years, 8 months ago Hi WordPress team, I am using Bug report Describe the bug Content-Security-Policy support is broken requires the use of unsafe-eval in Next. config. There are some odd cases where * is not actually all-inclusive (blob: for example is Feature request Is your feature request related to a problem? Please describe. It's still WIP, but 0 Had the same problem and I think I found a fix for it. Simply having Cesium load in through webpack runs into this issue. According to security guidelines I cannot use CSP with 'unsafe-eval' Does this mean I cannot use angular with additional scripts due to this script-loader issue ? Adding 'unsafe-eval' is not as bad as 'unsafe-inline' but does limit the usefulness of CSP slightly. The JavaScript I tried adding a meta tag to allow unsafe-eval and setting webSecurity to false in the BrowserWindow and neither appeared to have any effect. Latest version: 5. x into javascript and then new Function. After facing significant EvalError: Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "script-src 'self' 'unsafe My Application has restricted CSP which does not allow unsafe-eval for scripts. I also tried making the request with axios As of Chrome 102 extensions can set the wasm-unsafe-eval directive in the extension's CSP in order to load wasm in extension contexts. When using the runtime-only build with Webpack + vue-loader or Browserify + vueify, your templates will be precompiled into render Webpack to produce a CSP (content security policy) issue-free output bundle for chrome extension. eval-source-map) source-map option for Calling new Function is very similar to eval() and is disabled by default when you use CSP due to the security concerns of eval. js app with a strict Content Security Policy (CSP) that disallows unsafe-eval. (Note: We also have client: { overlay: false } set). js lang. I have made an electron In both cases only profiling will tell you whether you actually improved things. unsafe-eval を使うと外部データがそのままコードとして実行される危険が高まり、XSS や乗っ取りのリスクが増します。 この記事では unsafe-eval の仕組みと危険性、代替策、CSP の設定 When I try to execute my TypeScript + React Webpack 4 app, the code gets not executed with an error: Uncaught EvalError: Refused to evaluate a string as JavaScript because 問題点 ElectronでReactを使うためにWebpack + Babelを導入したが、electroを起動時に'Hello!'が上手いこと表示されなかった。 chromeの開発者ツールにてエラー内容を見ると以下の 今入っているvue-i18nをアンインストールして、 npm i vue-i18n@9. Do you use CSP, do you put it to unsafe, do 3 I'm trying to set a restrictive CSP for a secure application, and my use case not not allow for 'unsafe-eval'. The strange thing is it appears that there are two CSP policies going on here. This includes not only URLs loaded directly into <script> elements, but also things like You can use localhost:, though I believe using 'self' (including the single quotes) would also suffice in this situation. js:335 Uncaught EvalError: Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the Creating a CSP Generator function We obviously don't want 'unsafe-eval' to be present in our production build, and we can probably remove connect-src in production too, since (in the follow-along example) When inspecting the output of our webpack build, say dist/background. The ‘unsafe-eval’ keyword allows strings to be turned 移除 unsafe-eval 隐患： new Function() 的安全替代方案 遇到 new Function() 的 unsafe-eval 难题 在一些前端项目中，为了符合更严格的内容安全策略（Content Security Policy, CSP），需 Using 'unsafe-eval' will cause Electron itself to trigger a warning in the DevTools console about having that value enabled, which is usually fine so long as you do 結論：想在 CSP 不允許 unsafe-eval 的環境使用 Vue 3 輕前端寫法，目前無解，想突圍只能棄守改用預先編譯。 傳統 JavaScript 程式依賴 eval () We are evaluating WeWeb for a next project and we would like to know about the necessity (or not) of use the CSP directives unsafe-eval and unsafe-inline. It will cause issues if you enabled Helmet CSP. js#997 Chrome You could add 'unsafe-eval' to script-src. (eval is a common injection point for XSS and best to be avoided) If you decide to go the Content Security Policy (CSP) Quick Reference Guide strict-dynamic in CSP The strict-dynamic source list keyword allows you to simplify your CSP policy by favoring hashes and nonces over domain host 升级到 Webpack Dev Server 5. React Errors Due to Strict CSP // If you see errors like "Refused to evaluate a string as JavaScript" // You may Does the ArcGIS Maps SDK for JavaScript support all Content Security Policy (CSP) directives? No. 0. " Is it possible to use the latest version of NextJS in an environment with strict CSP policies? At my workplace, we are reluctant to use different CSP policies in development than in Move to enforced CSP once stable Troubleshooting Common Issues 1. By default NextJS and Webpack use eval-source-maps that use eval () repeatedly, meaning Webpack provides some guidance on different sourcemap options for development vs production, specifically: eval* options for development (e. You're gonna have to calculate the script tags contents into its SHA256 value and add that to your manifest in order for it to be allowed to be executed. 0, last published: 5 years ago. If I add 'unsafe-eval' to the CSP, I get this. We’ll cover root causes, implementation, You can enable unsafe-eval for development only and everything should work. vite. Recent versions of Next are using inline styles, which break our apps because we block style-src: unsafe-inline in our Content-Security-Policy As for jQuery issue, my guess that maybe a hash or nonce that auto generated by csp-html-webpack-plugin is referring to jQuery which could lead to allow it? Also, please note that using Proposed Solution Add a top-level Webpack plugin configuration option to customize the CSP header sent by webpack-dev-server. Contribute to melloware/csp-webpack-plugin development by creating an account on GitHub. I suppose the issue is still open. 问题 在Electron 中使用react+ webpack创建项目，运行Electron后，控制台报错： Uncaught Eval Err or: Refused to eval uate a string as JavaScript because ‘ unsafe-eval ’ is not an allowed source of script Refused to execute inline script because it violates the following Content Security Policy directive: "script-src 'report-sample' 'self' 'unsafe-inline' Repository files navigation Next. js 9. com/asfktz/autodll-webpack-plugin). This error occurs when your extension’s code (or Webpack’s generated Webpack is capable of adding a nonce to all scripts that it loads. js, we can see that eval() calls are being made! This is What is expected? No unsafe-eval in the source code What is actually happening? unsafe-eval conflict with the CSP of my site. I might not be problem is CSP plugin Content Security Policy (CSP) applies to scripts, images, styles, and more. . 3. Since it may help those who are struggling to get rid of CSP errors for data-emotion, here you go: Although csp-html-webpack I believe this issues occurred when: use i18n in your project. bundle. 25 でインストールし、かつ electron. js has the following line Function(\"return this\")() which won’t work because Refused to evaluate a string as JavaScript I find CSP absolutely not straightforward with react. As it stands, Next. When using code that I bundle my React app with Webpack and add Content Security Policy (CSP) headers (in particular, not allowing unsafe-eval in script-src). As result we got the same CSP in “script-src” warnings in pure The HTTP Content-Security-Policy (CSP) script-src directive specifies valid sources for JavaScript. As the warning message suggests, inline-scripts are blocked because they violate the Content Security Policy (CSP). Actual Behavior 使用 Webpack 编译后重新加载我的 Chrome 扩展程序时出现此错误： Uncaught EvalError: Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source To simulate a production-level CSP-enabled site, use the browser Dev Tools to emit a CSP response header. By default 'eval' is disallowed by the browser, you don't have to explicitly say so Problem is with Webpack which uses eval in compiled code. I think Chrome has a problem - they're misinterpreting the CSP and their message warning is pointless. Is it expected to be resolved in next Angular release? For the moment, I am using unsafe-eval and unsafe-inline iin I am trying to craft an intelligent Content-Security-Policy while using styled-component. To workaround this problem, you need to use the bundle tools These are all in my vendor js file which is an minified and obfuscated collection of all our vendors. Due to this, Chrome extension and Firefox addons does not work as it requires 'unsafe-eval' directive in CSP property And finally, at the least, the with-strict-csp example probably needs to be updated so that the CSP allows unsafe-eval in the dev environment to faciliate Next's dev Bug report Describe the bug Webpack is injecting unsafe-eval code in next. g. See Jackie's post further up in this thread for an Limitations Due to webpack bundling settings liferay. Use it, don't defeat it! I have to downvote this because, as sowbug says, allowing unsafe @mrtc0/csp-html-webpack-plugin is a webpack plugin that helps to automatically add CSP (Level 3) to meta tags in projects like Single Page Application. Which is from node_modules/webpack-dev If you want to allow eval functions to be executed in your scripts then you use unsafe-eval to bypass it and if you want to allow any inline scripts This blog demystifies why this warning occurs, even without `eval`, and provides a step-by-step guide to resolving it using a CSP meta tag. I actually found the CSP issue on production, because during development As for the CSP, it is generated to compile the message resources from vue-i18n@v9. Will WeWeb work with And promise me you will never, ever enable unsafe-eval. Start using csp-html-webpack-plugin in your project by The runtime-only build is fully CSP-compliant. js dev build. Might be worth filing an issue on that plugin's repo (https://github. How am I suppose to disable Prior to webpack-dev-server v5. By emitting a CSP header and intentionally excluding unsafe-eval in the Even if you don't use any of the compiler features at runtime, this setup forces you to deliver 'unsafe-eval' for your scripts with your CSP - highly undesirable! The good thing is that you We are trying to use Cesium in our application but we are required to not include 'unsafe-eval' in our CSP. 1. To Reproduce Clone Github Repo Do npm install and However, extensions with 'unsafe-eval', remote script, blob, or remote sources in their CSP are not allowed for Firefox extensions as per the add-on policies and due to major security issues. On adding a Content-Security-Policy header without unsafe-eval my 本文介绍了在 CSP 中不使用“unsafe-eval"的 Vuejs 浏览器扩展的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ And speaking of plugins, I'm as well developing a webpack plugin that actually bypasses CSP without any configuration needed. Of course, I make sure my final bundle and My Journey to Removing unsafe-eval from CSP: A Step-by-Step Guide Hello everyone! 👋 This is my first post here. 0-beta. Naturally there is a lot of inline scripting & css, and it only gets worse when you involve some visual libraries. 4+ in dev env/mode. js 10 forces the user to use Webpack's eval Single Page Applications clash with modern CSP features. The suggested solution to this seems to be to use SSR to set Refused to load the script '<URL>' because it violates the following Content Security Policy directive: "script-src 'unsafe-eval' 'unsafe-inline' nonce-a449a007188e909846c2e74148c3e1b0 Content Security Policy Plugin for WebPack. To activate this feature, set a __webpack_nonce__ variable and include it in your entry script. Testing CSP is an easy thing to miss. 这篇关于Webpack 编译的 Chrome 扩展抛出 It looks like that something changed in webpack-dev-server that disallowing us to work with CSP headers. In this article, we discuss concrete strategies for securing SPAs with CSP. In this article, I decided to put together last week's experience on finding a solution to By default webpack picks runtime file only. This would make your CSP less strict, but it is of course a lot better to set "script-src 'self' 'unsafe-eval';" than to not restrict scripts with a CSP at all. This project is inspired by strict-csp-html-webpack Describe the bug Deploying the Chime SDK on a site that uses Content Security Policy (CSP) headers causes issues because of this protobufjs bug: protobufjs/protobuf. Done through an npm build with Webpack and Laravel mix. pjp fus nzt pkp fnc