Zitadel - User Registration Bypass

The open-source identity infrastructure software Zitadel allows administrators to disable the user self-registration. Due to a missing security check in versions prior to 2.64.0, 2.63.5, 2.62.7, 2.61.4, 2.60.4, 2.59.5, and 2.58.7, disabling the "User Registration allowed" option only hid the...

zitadel

The Identity Infrastructure for Developers ZITADEL...

CVE-2026-109373

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 wi...

CVE-2026-109374

ZITADEL 3.0.0 before 4.19.2 contains a privilege escalation vulnerability in OIDC token exchange that allows end-user impersonators to impersonate administrators including IAMOWNER by bypassing the admin.impersonation check. Attackers holding IAMENDUSERIMPERSONATOR or ORGENDUSERIMPERSONATOR roles...

CVE-2026-109371

ZITADEL 3.0.0 before 4.18.0 contains a missing authentication vulnerability in the hosted Login V1 UI, where the change-username handler acts on the account bound to a login flow before any factor is verified. Unauthenticated attackers can submit a victim's login name and then post a new username...

CVE-2026-109372

ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication bypass in the SAML identity-provider intent callback, which verifies the assertion signature using the provider named in the request URL but resolves the user from the login intent without checking they match. Attackers...

EUVD-2026-97672

ZITADEL 3.0.0 before 4.19.2 contains a privilege escalation vulnerability in OIDC token exchange that allows end-user impersonators to impersonate administrators including IAMOWNER by bypassing the admin.impersonation check. Attackers holding IAMENDUSERIMPERSONATOR or ORGENDUSERIMPERSONATOR roles...

CVE-2026-109374 ZITADEL 3.0.0 before 4.19.2 Privilege Escalation via OIDC Token Exchange Impersonation

ZITADEL 3.0.0 before 4.19.2 contains a privilege escalation vulnerability in OIDC token exchange that allows end-user impersonators to impersonate administrators including IAMOWNER by bypassing the admin.impersonation check. Attackers holding IAMENDUSERIMPERSONATOR or ORGENDUSERIMPERSONATOR roles...

CVE-2026-109374

ZITADEL versions 3.0.0 before 4.19.2 are vulnerable to a privilege escalation flaw within the OIDC token exchange process. The root cause is a failure to properly validate the admin.impersonation check, allowing users with IAM_END_USER_IMPERSONATOR or ORG_END_USER_IMPERSONATOR roles to bypass res...

CVE-2026-109374 ZITADEL 3.0.0 before 4.19.2 Privilege Escalation via OIDC Token Exchange Impersonation

ZITADEL 3.0.0 before 4.19.2 contains a privilege escalation vulnerability in OIDC token exchange that allows end-user impersonators to impersonate administrators including IAMOWNER by bypassing the admin.impersonation check. Attackers holding IAMENDUSERIMPERSONATOR or ORGENDUSERIMPERSONATOR roles...

CVE-2026-109373

ZITADEL versions 3.0.0 before 4.19.2 are vulnerable to an authentication bypass in the Login V2 UI . The root cause allows unauthenticated attackers to forge unsigned session cookies by guessing time-ordered session IDs near a victim's sign-in. By supplying these IDs with empty tokens, attackers ...

EUVD-2026-97671

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 wi...

CVE-2026-109373 ZITADEL 3.0.0 before 4.19.2 Account Takeover via Unsigned Login V2 Session Cookie

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 wi...

CVE-2026-109373 ZITADEL 3.0.0 before 4.19.2 Account Takeover via Unsigned Login V2 Session Cookie

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 wi...

CVE-2026-109372

The ZITADEL identity platform (versions 4.x before 4.19.2 and 3.x through 3.4.15 ) is vulnerable to an authentication bypass in the SAML identity-provider intent callback. The root cause is a failure to verify that the provider name in the request URL matches the provider used to resolve the user...

EUVD-2026-97669

ZITADEL 3.0.0 before 4.18.0 contains a missing authentication vulnerability in the hosted Login V1 UI, where the change-username handler acts on the account bound to a login flow before any factor is verified. Unauthenticated attackers can submit a victim's login name and then post a new username...

EUVD-2026-97670

ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication bypass in the SAML identity-provider intent callback, which verifies the assertion signature using the provider named in the request URL but resolves the user from the login intent without checking they match. Attackers...

CVE-2026-109372 ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identity-Provider Confusion

ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication bypass in the SAML identity-provider intent callback, which verifies the assertion signature using the provider named in the request URL but resolves the user from the login intent without checking they match. Attackers...

CVE-2026-109372 ZITADEL 3.0.0 before 4.19.2 Account Takeover via SAML Identity-Provider Confusion

ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication bypass in the SAML identity-provider intent callback, which verifies the assertion signature using the provider named in the request URL but resolves the user from the login intent without checking they match. Attackers...

CVE-2026-109371 ZITADEL 3.0.0 before 4.18.0 Unauthenticated Username Change via Login V1

ZITADEL 3.0.0 before 4.18.0 contains a missing authentication vulnerability in the hosted Login V1 UI, where the change-username handler acts on the account bound to a login flow before any factor is verified. Unauthenticated attackers can submit a victim's login name and then post a new username...