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    CVE-2026-23511

    ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel's login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6.

    Published:Jan 15, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 15, 2026
    EPSS Score:0.00021
    CVSS Score:5.3

    Affected Products

    Vendor
    Zitadel
    Product
    Zitadel

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-204 Observable Response Discrepancy

    Related CVEs

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    CVE-2026-56666 (CVSS 4.8) — ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's external identity provider …
    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…

    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