CVE-2026-42604 Actual has an OpenID `client_secret` Disclosure via Broken Authorization Guard in `/openid/config`

Actual is a local-first personal finance tool. The POST /openid/config endpoint in Actual Budget's sync-server versions = 26.4.0 exposes the full OpenID Connect configuration—including the OAuth2 clientsecret—to any caller who knows the bootstrap password. The endpoint also lacks authentication a...