EUVD-2026-92101

ZITADEL 4.x before 4.17.3 and 3.x through 3.4.15 protects IdP intent tokens with unauthenticated, malleable encryption, allowing authenticated users to tamper with their own token so it is accepted for another user's external login intent. An attacker who predicts a victim's in-flight intent...

CVE-2026-105208

ZITADEL versions 4.x before 4.17.3 and 3.x through 3.4.15 are vulnerable to session hijacking due to the use of unauthenticated, malleable encryption for IdP intent tokens. This flaw allows authenticated users to tamper with their own tokens to be accepted for another user's external login intent...

CVE-2026-105208 ZITADEL before 4.17.3 Session Hijacking via Forgeable IdP Intent Tokens

ZITADEL 4.x before 4.17.3 and 3.x through 3.4.15 protects IdP intent tokens with unauthenticated, malleable encryption, allowing authenticated users to tamper with their own token so it is accepted for another user's external login intent. An attacker who predicts a victim's in-flight intent...