react-native-inappbrowser-reborn: A Security Review of the In-App Browser Package

react-native-inappbrowser-reborn is a widely used React Native package that opens an in-app browser using the OS-native SFSafariViewController on iOS and Chrome Custom Tabs on Android, and from a security standpoint it is a reasonable choice precisely because it delegates to those hardened system components rather than rolling its own web view. That design decision is the single most important thing to understand about it, and it shapes every risk question that follows.

The package sees over 160,000 weekly downloads and sits behind Tidelift-backed maintenance on the proyecto26/react-native-inappbrowser repository, so it is not an abandoned one-off. But "popular and maintained" is where a security review starts, not where it ends.

What the package does and why the design matters

Mobile apps constantly need to open external URLs: OAuth login flows, help pages, terms of service, payment redirects. You have three options. Kick the user out to their default browser, embed a raw WebView, or use a system-provided in-app browser tab.

The raw WebView route is the dangerous one. A WebView runs inside your app's process, can be scripted through injected JavaScript, does not share the system browser's cookie jar, and gives you a large surface for mistakes like setJavaScriptEnabled(true) combined with addJavascriptInterface. Phishing and credential theft in mobile apps frequently trace back to a misconfigured embedded web view.

react-native-inappbrowser-reborn takes the third route. It wraps SFSafariViewController (iOS) and Chrome Custom Tabs (Android). Those components render pages in a sandbox your app cannot read into. Your app cannot see the DOM, cannot inject scripts, and cannot read the page's cookies. For OAuth specifically, this is the pattern the OAuth 2.0 for Native Apps guidance (RFC 8252) recommends, because the user can see the real URL bar and the session uses the system's cookie store.

Where the actual risk lives

If the package itself is well-designed, where do problems come from? Three places.

1. Configuration, not the library. The most common issue is passing a URL you do not fully control, or building a redirect URI that an attacker can influence. The in-app browser will faithfully open whatever you hand it. If your deep-link handling or OAuth redirect_uri validation is loose, the browser is just the messenger.

2. Transitive and native dependencies. A React Native package is not only its JavaScript. It ships native iOS and Android code and may pull additional native dependencies during the CocoaPods and Gradle build. Your JavaScript SCA scan does not see any of that unless you also inventory the native layer. This is the blind spot most teams have with React Native modules generally.

3. The "reborn" naming pattern. The -reborn suffix signals a community fork that revived an abandoned original. That is common and often healthy, but it means you should confirm you are installing the fork you think you are. There are scoped variants on npm (for example, vendor-prefixed republishes), and typosquatting around popular packages is a known attack vector.

The wider "reborn" family and why it is worth noting

The same fork-and-revive story produced react-native-wifi-reborn, a separate package that exposes Wi-Fi scanning and connection APIs to React Native apps. It is unrelated in function, but it is a useful comparison because the security calculus is very different.

react native wifi reborn touches location and network permissions that both app stores scrutinize heavily. Wi-Fi scanning on Android is gated behind location permissions, and requesting them without a clear justification is a common review rejection and a privacy red flag. So while react-native-inappbrowser-reborn's risk is mostly about how you feed it URLs, a package like react-native-wifi-reborn carries meaningful permission and privacy weight before you write a single line of code.

The lesson is that the -reborn label tells you nothing about risk on its own. Each fork deserves its own review of permissions, native code, and maintenance health.

A practical vetting checklist

Before you add react-native-inappbrowser-reborn (or any native RN module), run through this:

# Confirm the exact package and version you are resolving
npm ls react-native-inappbrowser-reborn

# Inspect the tarball contents before it hits your build
npm pack react-native-inappbrowser-reborn --dry-run

# Check for known advisories
npm audit

Then answer, in order:

1. Is this the canonical package (proyecto26) or a fork/scoped republish? Confirm the repository URL on the npm page matches.
2. What native permissions does the module declare in its AndroidManifest.xml and iOS Info.plist requirements?
3. Are you passing only URLs you construct or validate, never raw user input?
4. When did it last publish, and does the release cadence look alive?

Software composition analysis handles the version and advisory checks continuously, and an SCA tool such as Safeguard can flag when a transitive dependency of the module picks up a known CVE between releases. That matters more than a one-time review, because the module you audited in Q1 is not the same dependency graph in Q3.

Keeping it safe in production

Once it is in, a few habits keep it boring:

• Validate every URL before opening it. Whitelist schemes (https only for external content) and, for OAuth, verify the redirect_uri against a fixed value.
• Pin the version and review changelogs on upgrade rather than floating on ^.
• Include the native layer in your mobile app scanning, not just the JavaScript bundle. A DAST-style check against the endpoints the browser hits complements static dependency review.
• Watch maintenance signals. A package with 160k weekly downloads and Tidelift backing is healthy today; set an alert so you notice if that changes.

FAQ

Is react-native-inappbrowser-reborn safe to use?

Broadly, yes. It delegates to the OS-native in-app browser components (SFSafariViewController and Chrome Custom Tabs), which are sandboxed and cannot be scripted by your app. That is a much safer default than embedding a raw WebView. The residual risk is in how you configure it, chiefly passing URLs you fully control and validating OAuth redirect URIs.

How is react-native-inappbrowser-reborn different from react-native-wifi-reborn?

They share only the community "reborn" fork naming. react-native-inappbrowser-reborn opens in-app browser tabs; react-native-wifi-reborn exposes Wi-Fi scanning and connection APIs. The Wi-Fi package requires sensitive location and network permissions and draws heavier app-store scrutiny, so its security and privacy profile is quite different despite the similar name.

Does an SCA scan cover React Native native modules?

Not fully by default. Most JavaScript SCA scans inventory the npm dependency tree but miss the native iOS and Android code and their CocoaPods or Gradle dependencies. To cover a React Native app properly you need to scan the native layer as well, which is a common blind spot.

Should I worry about typosquatting with "reborn" packages?

It is worth a quick check. Popular package names attract typosquats and misleading scoped republishes. Always confirm the repository URL on the npm listing points to the canonical maintainer before installing, and pin the exact version you reviewed.