Raphaël Bosi
49095dcfe0
## What Front components are third-party React components rendered into the host page through a restricted element allow-list. `filterProps` (where their props become real DOM attributes) used to forward unrecognized values as-is, which left two ways to run script in the host origin: - an `on*` attribute with a string value, which React renders as an inline event handler; - a dangerous-scheme URL (`javascript:`, `data:`, `vbscript:`) on a link, which executes on navigation. ## Change `filterProps` now drops both: - `on*` props are kept only when the value is a real function (still wrapped as before); any non-function `on*` is dropped. - `javascript:` / `data:` / `vbscript:` URLs are dropped, but only on **navigation targets** (`<a>`/`<area>` `href`/`xlink:href`, `<form>` `action`, `<button>`/`<input>` `formaction`), after normalizing away control-character obfuscation (e.g. `java\tscript:`). Resource-loading attributes are left alone, so `<img src="data:image/...">` keeps working. Well-behaved components are unaffected: function handlers are still wrapped and normal URLs pass through. Host-side only, no worker or SDK changes. ## Scope: the actual behavior change is small The diff looks large, but most of it is **not** a behavior change. `createHtmlHostWrapper.ts` (~460 lines) was split into one-export-per-file utils (`filterProps`, `serializeEvent`, `parseCssString`, `hasDangerousUrlScheme`, etc.), each with its own unit test, leaving `createHtmlHostWrapper.ts` as a thin orchestrator. Those helpers were **moved unchanged** — the only real logic change is the `filterProps` hardening described above. The pre-existing render-based integration test passes untouched, which confirms the split is behavior-neutral; the rest of the new files are extractions plus added test coverage. ## Why these schemes, and only on navigation targets Per MDN, `javascript:` (and `data:`) URLs are dangerous specifically where a URL is a *navigation target*, not where it is a *resource location* (like an image `src`) — which is exactly how the check is scoped: - [`javascript:` URLs (MDN)](https://developer.mozilla.org/en-US/docs/Web/URI/Reference/Schemes/javascript) - [`data:` URLs (MDN)](https://developer.mozilla.org/en-US/docs/Web/URI/Reference/Schemes/data) - [URI schemes overview (MDN)](https://developer.mozilla.org/en-US/docs/Web/URI/Reference/Schemes) This is a prerequisite for later work that widens the raw-attribute surface (innerHTML rendering).
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Twenty gives technical teams the building blocks for a custom CRM that meets complex business needs and quickly adapts as the business evolves. Twenty is the CRM you build, ship, and version like the rest of your stack.
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The fastest way to get started. Sign up at twenty.com and spin up a workspace in under a minute, with no infrastructure to manage and always up to date.
Build an app
Scaffold a new app with the Twenty CLI:
npx create-twenty-app my-app
Define objects, fields, and views as code:
import { defineObject, FieldType } from 'twenty-sdk/define';
export default defineObject({
nameSingular: 'deal',
namePlural: 'deals',
labelSingular: 'Deal',
labelPlural: 'Deals',
fields: [
{ name: 'name', label: 'Name', type: FieldType.TEXT },
{ name: 'amount', label: 'Amount', type: FieldType.CURRENCY },
{ name: 'closeDate', label: 'Close Date', type: FieldType.DATE_TIME },
],
});
Then ship it to your workspace:
npx twenty app:publish --private
See the app development guide for objects, views, agents, and logic functions.
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Run Twenty on your own infrastructure with Docker Compose, or contribute locally via the local setup guide.
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Twenty gives you the building blocks of a modern CRM (objects, views, workflows, and agents) and lets you extend them as code. Here's a tour of what's in the box.
Want to go deeper? Read the 
User Guide for product walkthroughs, or the Documentation for developer reference.
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