CVE-2026-105211 ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode

ZITADEL before 4.17.1 contains an authentication bypass vulnerability in Login V2 that allows unauthenticated attackers to take over accounts by obtaining OTP codes via the returnCode delivery type. Attackers knowing a login name of a victim with OTP-Email and OTP-SMS enrolled can read both codes...

CVE-2026-105209 ZITADEL before 3.4.15 and 4.17.1 Cross-Organization Account Takeover via Passkey Enrollment

ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains an improper authorization vulnerability: when issuing passkey or passwordless enrollment codes, it checks only the organization in the x-zitadel-orgid header, not the target user's organization. Attackers with user-write permission in one...

CVE-2026-105210 ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers

ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains a missing authentication flaw in the hosted Login V1 UI, whose second-factor enrollment and initialization handlers act on an identify-only session before any primary factor is verified. Attackers knowing only a victim's login name can enro...

CVE-2026-105210

ZITADEL versions 3.x before 3.4.15 and 4.x before 4.17.1 are vulnerable to a missing authentication flaw in the hosted Login V1 UI . The root cause is that second-factor enrollment and initialization handlers process requests on an identify-only session before the primary factor is verified. An a...

EUVD-2026-92103

ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains a missing authentication flaw in the hosted Login V1 UI, whose second-factor enrollment and initialization handlers act on an identify-only session before any primary factor is verified. Attackers knowing only a victim's login name can enro...

CVE-2026-105209 ZITADEL before 3.4.15 and 4.17.1 Cross-Organization Account Takeover via Passkey Enrollment

ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains an improper authorization vulnerability: when issuing passkey or passwordless enrollment codes, it checks only the organization in the x-zitadel-orgid header, not the target user's organization. Attackers with user-write permission in one...

EUVD-2026-92102

ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains an improper authorization vulnerability: when issuing passkey or passwordless enrollment codes, it checks only the organization in the x-zitadel-orgid header, not the target user's organization. Attackers with user-write permission in one...

CVE-2026-105210

ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains a missing authentication flaw in the hosted Login V1 UI, whose second-factor enrollment and initialization handlers act on an identify-only session before any primary factor is verified. Attackers knowing only a victim's login name can enro...

CVE-2026-105210 ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers

ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains a missing authentication flaw in the hosted Login V1 UI, whose second-factor enrollment and initialization handlers act on an identify-only session before any primary factor is verified. Attackers knowing only a victim's login name can enro...

CVE-2026-105209

ZITADEL versions 3.x before 3.4.15 and 4.x before 4.17.1 are vulnerable to an improper authorization flaw (CWE-862) during passkey or passwordless enrollment. The system incorrectly validates the organization ID provided in the x-zitadel-orgid header instead of verifying the target user's actual ...

CVE-2026-105209 ZITADEL before 3.4.15 and 4.17.1 Cross-Organization Account Takeover via Passkey Enrollment

ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains an improper authorization vulnerability: when issuing passkey or passwordless enrollment codes, it checks only the organization in the x-zitadel-orgid header, not the target user's organization. Attackers with user-write permission in one...

CVE-2026-105210 ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers

ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains a missing authentication flaw in the hosted Login V1 UI, whose second-factor enrollment and initialization handlers act on an identify-only session before any primary factor is verified. Attackers knowing only a victim's login name can enro...

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...

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-2026-105207 ZITADEL before 4.17.3 Account Takeover via External IdP Linking

ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3 creates links between user accounts and external identity providers without verifying a primary factor or the caller's permission, including on identify-only Login V2 sessions and via the User Service V2 AddIDPLink endpoint. An unauthenticated...

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...

CVE-2026-105207 ZITADEL before 4.17.3 Account Takeover via External IdP Linking

ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3 creates links between user accounts and external identity providers without verifying a primary factor or the caller's permission, including on identify-only Login V2 sessions and via the User Service V2 AddIDPLink endpoint. An unauthenticated...

EUVD-2026-92100

ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3 creates links between user accounts and external identity providers without verifying a primary factor or the caller's permission, including on identify-only Login V2 sessions and via the User Service V2 AddIDPLink endpoint. An unauthenticated...

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...

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...