React Profile
Find out how the presence of React is fingerprinted, associated security risks, and recommended configurations.
What is React?
React is an open-source, front-end JavaScript library for building user interfaces. It is maintained by Meta and a community of individual developers and companies.
Security and Vulnerability Footprint
React features built-in XSS protections via automated escaping. However, developers can bypass this security layer using dangerouslySetInnerHTML. Passive checking looks for React Developer Tools global hooks and data-reactroot attributes to identify active builds.
Defensive Best Practices
Ensure all React library packages are kept up to date. Avoid injecting unsanitized user inputs into dangerouslySetInnerHTML, and evaluate script bundle sizes to prevent exposure of internal source maps in production deployments.
Frequently Asked Questions
How do you detect if a website is built with React?
React websites can be identified by specific DOM attributes like 'data-reactroot' or React global properties under the browser's window object.
Is React secure against Cross-Site Scripting (XSS)?
Yes, by default, React escapes values before rendering them. However, using dangerouslySetInnerHTML or old versions of packages can introduce XSS configuration risks.
What is the role of React Developer Tools in profiling?
React Developer Tools hooks into the __REACT_DEVTOOLS_GLOBAL_HOOK__ variable, which our detector uses to verify the framework is active.