CVE-2026-67332 @better-auth/oauth-provider before 1.7.0-beta.4 Authorization Bypass

@better-auth/oauth-provider before 1.7.0-beta.4 fails to bind access-token audience to the authorization grant, allowing clients to request tokens for unrelated resources. Attackers can complete an OAuth flow and obtain access tokens whose audience targets resource servers the authorization never...

CVE-2026-67332

Technical details (affected products/versions/mitigation) are not publicly provided in the supplied documents. Monitor for updates.

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...

GHSA-P2FR-6HMX-4528 @better-auth/oauth-provider may provide access tokens for unauthorized audiences via unbound resource indicators

Am I affected? Users are affected if all of the following hold: - Their application depends on @better-auth/oauth-provider on any stable 1.6.x release the stable line is not patched or on a pre-release before 1.7.0-beta.4. - Their application either configures validAudiences with more than one...