Insufficiently Protected Credentials Affecting expo package, versions >=45.0.0 <48.0.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-EXPO-13559201
- published16 Oct 2025
- disclosed24 Apr 2023
- creditAkshay hbabathe
Introduced: 24 Apr 2023
CVE-2023-28131 (opens in a new tab)How to fix?
Upgrade expo to version 48.0.0 or higher.
Overview
expo is an umbrella package that contains the client-side code for accessing system functionality such as contacts, camera, and location in Expo apps.
Affected versions of this package are vulnerable to Insufficiently Protected Credentials via the Expo AuthSession Redirect Proxy process. An attacker can gain unauthorized access to user accounts and obtain sensitive credentials by tricking a victim into clicking a crafted malicious link.
This is because auth.expo.io stores an app’s callback URL before the user explicitly confirms they trust it.
Note: The vulnerability has been mitigated by requiring users to confirm unverified callback URLs.
In addition, developers are advised to migrate from useProxy and the auth.expo.io service (deprecated as of SDK 48) to using their own deep links with third-party authentication providers directly, which is more secure and reliable.