@better-auth/sso provider registration has server-side request forgery via unvalidated OIDC endpoints

Am I affected? Users are affected if all of the following are true: - Their application uses @better-auth/sso at a version = 0.1.0, 1.6.11 on the stable line, or any 1.7.0-beta.x on the pre-release line. - The sso plugin is added to their application's betterAuth plugins: ... array. - Any user wi...

GHSA-392P-2Q2V-4372 Better Auth: OAuth refresh-token rotation forks the token family on concurrent redemption

Am I affected? Users are affected if all of the following are true: - Their project depends on @better-auth/oauth-provider at a version = 1.6.0, = 1.4.8-beta.7, 1.6.0. - At least one OAuth client served by their application's authorization server requests the offlineaccess scope, so refresh token...

Insufficient Session Expiration

Overview @better-auth/oauth-provider is an An oauth provider plugin for Better Auth Affected versions of this package are vulnerable to Insufficient Session Expiration through the POST /oauth2/token endpoint during the refresh token granting. An attacker can gain unauthorized access by exploiting...

NPM: Better Auth: OAuth refresh-token rotation forks the token family on concurrent redemption

NPM: Better Auth: OAuth refresh-token rotation forks the token family on concurrent redemption vulnerability discovered by ? in WordPress Npm better-auth versions = 1.4.8-beta.7, 1.6.0...

GHSA-9H47-PQCX-HJR4 Better Auth has insecure cryptographic defaults in oidcProvider: alg=none advertised and plain PKCE accepted by default

Am I affected? Users are affected if all of the following are true: - Their application uses better-auth at a version below the patched release. - Their application enables oidcProvider from better-auth/plugins/oidc-provider or mcp from better-auth/plugins/mcp the mcp plugin delegates to...

GHSA-86J7-9J95-VPQJ Better Auth has stored XSS in the auth-server origin via javascript: redirect_uri in oidc-provider and mcp

Am I affected? Check each condition. Users are affected when all of the first three hold. - Their application enables the oidc-provider plugin or the mcp plugin from better-auth/plugins. The mcp plugin wraps the same provider and carries the same defect. Both are on the migration path to...

Authentication Bypass Using an Alternate Path or Channel

Overview better-auth is a The most comprehensive authentication library for TypeScript. Affected versions of this package are vulnerable to Authentication Bypass Using an Alternate Path or Channel in the handleOAuthUserInfo. An attacker can gain unauthorized access to user accounts by...

Authentication Bypass Using an Alternate Path or Channel

Overview @better-auth/core is a The most comprehensive authentication framework for TypeScript. Affected versions of this package are vulnerable to Authentication Bypass Using an Alternate Path or Channel in the handleOAuthUserInfo. An attacker can gain unauthorized access to user accounts by...

NPM: Better Auth has an account takeover issue via OAuth auto-link to unverified pre-registered email

NPM: Better Auth has an account takeover issue via OAuth auto-link to unverified pre-registered email vulnerability discovered by ? in WordPress Npm better-auth versions 1.6.11...

GHSA-G38M-R43W-P2Q7 Better Auth has an account takeover issue via OAuth auto-link to unverified pre-registered email

Am I affected? Users are affected if all of the following are true: - Their application uses better-auth at a version 1.6.11 on the stable line, or any current next pre-release. - emailAndPassword.enabled: true is set in their application's betterAuth ... configuration. - At least one OAuth or SS...

Better Auth vulnerable to unauthorized invitation acceptance via unverified email match in organization plugin

Am I affected? Users are affected if all of the following are true: - Their application uses better-auth with the organization plugin import organization from "better-auth/plugins/organization". - Their application enables a sign-up surface that allows arbitrary unverified email registration. Mos...

GHSA-FMH4-WCC4-5JM3 Better Auth vulnerable to unauthorized invitation acceptance via unverified email match in organization plugin

Am I affected? Users are affected if all of the following are true: - Their application uses better-auth with the organization plugin import organization from "better-auth/plugins/organization". - Their application enables a sign-up surface that allows arbitrary unverified email registration. Mos...

NPM: Better Auth vulnerable to unauthorized invitation acceptance via unverified email match in organization plugin

NPM: Better Auth vulnerable to unauthorized invitation acceptance via unverified email match in organization plugin vulnerability discovered by ? in WordPress Npm better-auth versions 1.6.11...

Missing Authorization

Overview better-auth is a The most comprehensive authentication library for TypeScript. Affected versions of this package are vulnerable to Missing Authorization in the acceptInvitation function of the organization plugin when the system relies solely on an unverified email-string equality check ...

GHSA-PW9M-5JXM-XR6H Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins

Am I affected? Users are affected if all of the following are true: - Their application uses better-auth and has enabled at least one of: oidcProvider imported from better-auth/plugins/oidc-provider, or mcp imported from better-auth/plugins/mcp. - Their application has at least one confidential...

Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins

Am I affected? Users are affected if all of the following are true: - Their application uses better-auth and has enabled at least one of: oidcProvider imported from better-auth/plugins/oidc-provider, or mcp imported from better-auth/plugins/mcp. - Their application has at least one confidential...

PT-2026-56299

Name of the Vulnerable Software and Affected Versions Better Auth versions prior to 1.6.11 Better Auth versions 1.6.14 and later Description An issue exists in the organization plugin where the acceptInvitation, rejectInvitation, getInvitation, and listUserInvitations endpoints do not sufficientl...

PT-2026-56297

Name of the Vulnerable Software and Affected Versions better-auth versions prior to 1.6.11 Description The legacy oidcProvider and mcp plugins expose an OAuth 2.0 token endpoint that fails to authenticate confidential clients during the refresh token grant. The system authenticates requests based...

PT-2026-56298

Name of the Vulnerable Software and Affected Versions @better-auth/sso versions 0.1.0 through 1.6.10 @better-auth/sso versions 1.7.0-beta.x Description An SSRF flaw exists in the provider registration flow where OpenID Connect OIDC endpoint URLs are accepted without proper validation. When...

PT-2026-56300

Name of the Vulnerable Software and Affected Versions Better Auth versions prior to 1.6.11 Description An issue exists in the OAuth callback auto-link gate within the handleOAuthUserInfo function. The system allows implicit account linking when an OAuth provider asserts email verified: true witho...