GitHub Advisoryadvisory · npm
GHSA-36rg-gfq2-3h56 Better Auth Open Redirect Vulnerability in originCheck Middleware Affects Multiple Routes
LOW
Official page ↗
- Aliases
- CVE-2025-53535
- Ecosystem
- npm
- Packages
- better-auth
- Severity
- Low
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Weaknesses
- CWE-601
- Reviewed
- 2025-07-07
Affected packages
• npm better-auth: < 1.2.10 → fixed in 1.2.10
Description
Summary
An open redirect has been found in the `originCheck` middleware function, which affects the following routes: `/verify-email`, `/reset-password/:token`, `/delete-user/callback`, `/magic-link/verify`, `/oauth-proxy-callback`.
Details
In the `matchesPattern` function, `url.startsWith(` can be deceived with a `url` that starts with one of the `trustedOrigins`.
```jsx
const matchesPattern = (url: string, pattern: string): boolean => {
if (url.startsWith("/")) {
return false;
}
if (pattern.includes("*")) {
return wildcardMatch(pattern)(getHost(url));
}
return url.startsWith(pattern);
};
```
Open Redirect PoCs
```jsx
export const auth = betterAuth({
baseURL: 'http://localhost:3000',
trustedOrigins: [
"http://trusted.com"
],
emailAndPassword: {
...
},
})
```
`/reset-password/:token`
`/verify-email`
`/delete-user/callback`
`/magic-link/verify`
`/oauth-proxy-callback`
Impact
Untrusted open redirects in various routes.
Related
Alias · CVE (1)
- CVE-2025-53535 Better Auth is an authentication and authorization library for TypeScript. vulnerability
Weakness · CWE (1)
- CWE-601 URL Redirection to Untrusted Site weakness