CVE-2026-16442: Origin Validation Error

A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with contr...

PT-2026-68183

Name of the Vulnerable Software and Affected Versions Keycloak affected versions not specified Description A flaw exists in the SAML broker component used for identity federation and user authentication. The IdP-initiated Single Sign-On endpoint fails to verify if a provider is restricted to...

EUVD-2026-48305

Logto allows unverified email-based SSO account linking, enabling an attacker to register an identity at a permissive IdP using a victim’s email and gain unauthorized access to the victim’s account...

GHSA-X445-F3H2-J279 Auth.js: OAuth state, nonce, and PKCE check cookies are not bound to the provider that created them

Summary Auth.js stores the OAuth/OIDC anti-CSRF checks state, nonce, and the PKCE verifier in global cookies that are not bound to the provider that created them. On callback, a check value minted during a sign-in started with one provider can satisfy the callback for a different provider, becaus...

Auth.js: OAuth state, nonce, and PKCE check cookies are not bound to the provider that created them

Summary Auth.js stores the OAuth/OIDC anti-CSRF checks state, nonce, and the PKCE verifier in global cookies that are not bound to the provider that created them. On callback, a check value minted during a sign-in started with one provider can satisfy the callback for a different provider, becaus...

PT-2026-71317

Name of the Vulnerable Software and Affected Versions @auth/core versions prior to 0.41.3 next-auth versions prior to 4.24.15 next-auth versions prior to 5.0.0-beta.32 Description Auth.js stores the OAuth/OIDC anti-CSRF checks state, nonce, and the PKCE verifier in global cookies that are not bou...

CVE-2026-15611: Improper Authentication

Logto allows unverified email-based SSO account linking, enabling an attacker to register an identity at a permissive IdP using a victim’s email and gain unauthorized access to the victim’s account...

CVE-2026-53513

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: tru...

CVE-2026-53516

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts emailverified: true without requiring the local user row's emailVerified...

CVE-2026-53513

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: tru...

CVE-2026-53513 Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: tru...

EUVD-2026-44733

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: tru...

CVE-2026-53513 Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: tru...

EUVD-2026-44732

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts emailverified: true without requiring the local user row's emailVerified...

CVE-2026-53513: Improper Input Validation

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: tru...

CVE-2026-53516: Improper Authentication

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts emailverified: true without requiring the local user row's emailVerified...

CVE-2026-56666 ZITADEL: Auto-linking by email: IdP-side email verification is not checked

ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's external identity provider handler checks that the local user's email is verified but does not verify that the external IdP confirmed ownership of the same email before auto-linking by email, allowing a permissive...

CVE-2026-56666: Improper Authentication

ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's external identity provider handler checks that the local user's email is verified but does not verify that the external IdP confirmed ownership of the same email before auto-linking by email, allowing a permissive...

PT-2026-57254

Name of the Vulnerable Software and Affected Versions ZITADEL versions prior to 4.15.3 Description The external identity provider handler fails to verify that the external identity provider confirmed ownership of an email address before performing auto-linking by email. While the system checks if...

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...