CVE-2026-109373 [HIGH] – ZITADEL 3.0.0 before 4.19.2 contains an authentication bypass vulnerability in the Login V

ZITADEL 3.0.0 before 4.19.2 contains an authentication bypass vulnerability in the Login V2 UI that allows unauthenticated attackers to obtain other users’ session tokens by forging unsigned session cookies. Attackers can guess time-ordered session IDs around a victim’s sign-in and supply them with empty tokens to receive rotated tokens, taking over accounts including MFA-completed administrator sessions.