CVE-2026-33318: Actual has Privilege Escalation via 'change-password' Endpoint on OpenID-Migrated Servers

Any authenticated user (including BASIC role) can escalate to ADMIN on servers migrated from password authentication to OpenID Connect. Three weaknesses combine: POST /account/change-password has no authorization check, allowing any session to overwrite the password hash; the inactive password auth row is never removed on migration; and the login endpoint accepts a client-supplied loginMethod that bypasses the server’s active auth configuration. Together these allow an attacker to set a known password and authenticate as the anonymous admin account created during the multiuser migration.