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    CVE-2026-105215

    ZITADEL before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 UI because the 'external account not found' registration endpoint trusts client-supplied external identity fields without a completed IdP callback. Unauthenticated attackers can submit forged IDPConfigID and ExternalUserID values to pre-create an account bound to a victim's external IdP identity, which the victim's later genuine external login then signs into.

    Published:Oct 4, 2026
    Last Modified:Oct 5, 2026
    EPS:Oct 4, 2026
    EPSS Score:0.00339
    CVSS Score:9.1

    Affected Products

    Vendor
    Zitadel
    Product
    Zitadel

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-119129 (CVSS 8.6) — ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.19.5 contains a missing authorization vulnerability in Login V…
    CVE-2026-119128 (CVSS 9.1) — ZITADEL 4.0.0 before 4.19.5 contains an authentication bypass vulnerability in the Login V2 UI that allows una…
    CVE-2026-119127 (CVSS 8.6) — ZITADEL 4.0.0 before 4.19.5 contains a host header injection vulnerability in the Login V2 UI that allows unau…
    CVE-2026-109374 (CVSS 5.1) — ZITADEL 3.0.0 before 4.19.2 contains a privilege escalation vulnerability in OIDC token exchange that allows e…
    CVE-2026-109373 (CVSS 9.2) — ZITADEL 3.0.0 before 4.19.2 contains an authentication bypass vulnerability in the Login V2 UI that allows una…
    CVE-2026-109372 (CVSS 9.3) — ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication bypass in the SAML identity-provid…
    CVE-2026-109371 (CVSS 8.8) — ZITADEL 3.0.0 before 4.18.0 contains a missing authentication vulnerability in the hosted Login V1 UI, where t…
    CVE-2026-105214 (CVSS 2.3) — Zitadel before 4.16.2 contains a server-side request forgery vulnerability that allows attackers to make the s…
    CVE-2026-105213 (CVSS 8.8) — ZITADEL 4.x before 4.17.1 does not check an organization's inactive state during Login V2 authentication, veri…
    CVE-2026-105212 (CVSS 8.7) — ZITADEL 3.x before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 and L…

    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