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    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 to rename any active human user, including administrators, locking them out.

    Published:Oct 12, 2026
    Last Modified:Oct 15, 2026
    EPS:Oct 12, 2026
    EPSS Score:0.00363
    CVSS Score:8.2

    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-2026-105215 (CVSS 9.3) — ZITADEL before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 UI becaus…
    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