Neither Angular nor React is more secure in a way that decides your risk. Both escape untrusted data by default, which blocks most cross-site scripting. Both also provide escape hatches that reintroduce it. Your outcome depends on how you use those hatches, how you manage dependencies and how you secure the server.
What do both frameworks do by default?
Both treat values rendered in templates as text. If a user submits a script tag as a comment, it displays as characters, not code. This is the single biggest protection, and it is why classic reflected and stored cross-site scripting is rarer in framework apps than in hand-built pages.
OWASP's XSS prevention cheat sheet explains the principle: encode output for the context it lands in. Frameworks automate this for common contexts.
How do they differ?
Angular ships a built-in sanitiser and treats security as part of the framework. Its security guide describes sanitising values bound into HTML, styles and URLs, and it names specific methods that bypass sanitisation, the bypassSecurityTrust family. The method names are deliberately loud.
React escapes values in JSX and exposes dangerouslySetInnerHTML for raw HTML. The name is the warning. React leaves sanitising to you, so teams pair it with a sanitiser library when they must render user HTML. Link destinations are another area to watch, since a javascript scheme in a link attribute can run code on click if you pass untrusted URLs.
In short, Angular gives more guardrails inside the framework, and React gives a smaller core and more freedom. More freedom means more decisions, and each one needs a reviewer.
Where does the real risk live?
Escape hatches. Search both codebases for the bypass methods and the raw HTML property. Each use needs a reason and a sanitiser.
Dependencies. A typical front end pulls hundreds of packages through npm. A vulnerable or malicious package is a bigger risk than the framework itself.
Server and API. Authentication, authorisation and input validation happen on the server. A client framework cannot enforce them. The OWASP API Security Top 10 starts with broken object level authorisation, which no front end framework prevents.
Token storage. Where you keep session tokens matters. Cookies with the HttpOnly flag are not readable by script, which limits what an XSS bug can steal.
Content Security Policy. A strict policy adds a second layer that limits what injected script can do. The W3C specification describes it.
A constructed example
Two teams build an admin dashboard that shows user-submitted notes with formatting. Team Angular binds the note into an HTML property, so the sanitiser strips script. A developer later adds a bypass call to keep a style attribute, and an injected payload survives. Team React uses dangerouslySetInnerHTML with a sanitiser library, and a dependency update changes the sanitiser's allowed tags unnoticed.
Different frameworks, same failure shape: a hatch used without a test. Both teams fix it by adding a unit test that feeds hostile input to the rendering path and by flagging every hatch in code review.
Does the framework version matter?
Yes. Security fixes ship in framework releases, and old versions stop receiving them. Keep the framework, the router, the build tooling and the sanitiser library on supported versions, and read release notes for security entries. Teams that stay two or three major versions behind accumulate known flaws that scanners flag every week. Plan upgrades as routine work, not rescue projects, and keep tests around the rendering paths that handle user content so an upgrade cannot quietly change what gets escaped.
How to check or apply this
- Grep for the bypass methods and raw HTML properties and list every use.
- Add tests with hostile input for each one.
- Set a Content Security Policy and tighten it over time.
- Keep session cookies HttpOnly and secure.
- Scan front end dependencies on every build and decide which findings block merges.
- Enforce authorisation on the server for every object and action.
Safeguard's code scanning and dependency scanning can flag risky sinks and vulnerable packages in either stack, and reachability analysis shows which advisories your code touches.
Quick check
Does using React or Angular prevent XSS?
It prevents the common cases by escaping output. Raw HTML features, unsafe URLs and vulnerable dependencies can still cause it.
Is client-side validation enough?
No. Anyone can bypass the client. Validate and authorise on the server.
Sources
- Security, Angular documentation
- Common components, React documentation
- Cross Site Scripting Prevention Cheat Sheet, OWASP
- OWASP API Security Project, OWASP
- Content Security Policy Level 3, W3C
Last reviewed: 18 October 2026.
