Description
better-auth before 1.6.13 (and pre-release builds 1.7.0-beta.0 through 1.7.0-beta.3) fail to validate the scheme of redirect_uris registered via the deprecated oidc-provider plugin and the mcp plugin (which wraps the same provider). An attacker can register an OAuth client with a javascript: redirect_uri, which the authorization server later returns unchanged in the consent response. If the deployment's consent page navigates the browser to the returned redirectURI (e.g. assigning it to window.location.href), the attacker's JavaScript executes in the authorization-server origin, exposing the victim's session and enabling account takeover.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
better-auth better-auth
Default version status: unaffected
0 to < 1.6.13affected1.6.13unaffected
pkg:npm/better-authbetter-auth better-auth
Default version status: unaffected
1.7.0-beta.0 to < 1.7.0-beta.4affected1.7.0-beta.4unaffected
pkg:npm/better-auth