CVE-2025-53535
lowpriority · track · 0EPSS 0.004 · 32 %ileEUUSEPSS · scored 2026-10-27
Better Auth is an authentication and authorization library for TypeScript. 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. This vulnerability is fixed in 1.2.10.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
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weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-36rg-gfq2-3h56Better Auth Open Redirect Vulnerability in originCheck Middleware Affects Multiple Routes2025-07-07ghsa · osvUS
### 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` <img width="481" alt="image" src="https://github.com/user-attachments/assets/46e7871a-1dad-4375-af94-0446e29aaab6" /> <br/> <img width="518" alt="image 1" src="https://github.com/user-attachments/assets/83abfb53-6fc9-4d1f-918d-9b4ce093c808" /> #### `/verify-email` <img width="549" alt="image" src="https://github.com/user-attachments/assets/7dd424b7-42a4-4616-aa73-fcc2e3eeb309" /> <br/> <img width="436" alt="image" src="https://github.com/user-attachments/assets/54f11636-0a3e-4e83-9a09-57c5e8ba98cd" /> #### `/delete-user/callback` <img width="545" alt="image" src="https://github.com/user-attachments/assets/2ff1b217-d069-48fb-81c1-f8c8792d34a4" /> <br/> <img width="492" alt="image" src="https://github.com/user-attachments/assets/71df11db-9d38-4f34-abe1-add9d60b3486" /> #### `/magic-link/verify` <img width="379" alt="image" src="https://github.com/user-attachments/assets/6b6b6a8a-59b6-4a65-9df3-57d5b2f6eb0f" /> <br/> <img width="413" alt="image" src="https://github.com/user-attachments/assets/82a5c9c6-2ea0-44eb-af48-40732657b59e" /> #### `/oauth-proxy-callback` <img width="548" alt="image" src="https://github.com/user-attachments/assets/d8d2ee51-e9fd-4337-bec3-a70afd1ceacb" /> <br/> <img width="544" alt="image" src="https://github.com/user-attachments/assets/f097d406-b965-4f85-b124-9b0ef1cc2689" /> ### Impact Untrusted open redirects in various routes.
also known as (3)
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sources
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references (5)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2025-53535cnnvd
- https://github.com/better-auth/better-auth/releasesPatchcnnvd
- https://github.com/better-auth/better-auth/security/advisories/GHSA-36rg-gfq2-3h56cnnvd
- https://github.com/better-auth/better-auth/security/advisories/GHSA-36rg-gfq2-3h56enisa_euvd
- https://github.com/better-auth/better-auth/security/advisories/GHSA-36rg-gfq2-3h56nvd
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