EUVD-2026-33073

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.4.17 and 1.5.0-beta.9, Better Auth's HTTP rate limiter keyed each request by the exact textual IP address it received in x-forwarded-for or the configured IP-bearing header. IPv6 clients controlling a typical /6...

NPM: Better Auth: Rate limiter keys IPv6 addresses individually and is bypassable via prefix rotation

NPM: Better Auth: Rate limiter keys IPv6 addresses individually and is bypassable via prefix rotation vulnerability discovered by ? in WordPress Npm better-auth versions 1.4.17...

GHSA-P6V2-XCPG-H6XW Better Auth: Rate limiter keys IPv6 addresses individually and is bypassable via prefix rotation

Am I affected? Users are affected if all of the following are true: - Their app uses better-auth at a version 1.4.17, or at a v1.5 prerelease tagged = 1.5.0-beta.8. - The apps authentication endpoints serve clients reachable over IPv6. Most managed hosts including Cloudflare, Vercel, Fly.io, AWS...

GHSA-WXW3-Q3M9-C3JR Better Auth: OAuth callback accepts mismatched `state` when cookie-backed state storage is used without PKCE

Am I affected? Users are affected if all of the following are true: - The application uses better-auth at a version below 1.6.2 or @better-auth/sso paired with such a version. - betterAuth account: storeStateStrategy is set to "cookie". The default "database" is not affected. - The application...

Better Auth 安全漏洞

Better Auth is an open-source TypeScript framework for authentication. Versions of Better Auth prior to 1.6.5 contained a security vulnerability. This vulnerability stemmed from the clientPrivileges option recording creation operations. However, the OAuth client did not call the hook before...

Better Auth Passkey Plugin allows passkey deletion through IDOR

Summary Affected versions of the better-auth passkey plugin allow users with any valid session to delete arbitrary passkeys via their ID using POST /passkey/delete-passkey. Details ctx.body.id is implicitly trusted and used in passkey deletion queries. better-auth applications configured with...