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    CVE-2026-56666

    ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's external identity provider handler checks that the local user's email is verified but does not verify that the external IdP confirmed ownership of the same email before auto-linking by email, allowing a permissive provider account with a victim email address to be linked to the victim's local account. This issue is fixed in version 4.15.3.

    Published:Jul 10, 2026
    Last Modified:Jul 13, 2026
    EPS:Jul 10, 2026
    EPSS Score:0.00189
    CVSS Score:4.8

    Affected Products

    Vendor
    Zitadel
    Product
    Zitadel

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2026-54693 (CVSS 8.2) — ZITADEL is an open source identity management platform. From 2.43.0 through 2.71.19, from 3.0.0 until 3.4.11, …
    CVE-2026-56668 (CVSS 8.1) — ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's OAuth2 Token Exchange endpo…
    CVE-2026-56667 (CVSS 7.3) — ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL Login V2 OIDC and SAML Failed…
    CVE-2026-56665 (CVSS 4.2) — ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL is an open source …
    CVE-2026-56664 (CVSS 4.2) — ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's external JWT Ide…
    CVE-2026-55672 (CVSS 7.4) — ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's OAuth2 and OIDC …
    CVE-2026-55671 (CVSS 2.3) — ZITADEL is an open source identity management platform. From 4.0.0-rc.1 through 4.15.1, ZITADEL's HTTP notific…
    CVE-2026-55670 (CVSS 2.3) — ZITADEL is an open source identity management platform. Prior to 4.15.1, ZITADEL's event store validation can …
    CVE-2026-55669 (CVSS 4.2) — ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's external JWT Ide…
    CVE-2026-44671 (CVSS 7.5) — ZITADEL is an open source identity management platform. From 2.71.11 to before 3.4.10 and 4.15.0, a vulnerabil…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High