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    CVE-2026-56668

    ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's OAuth2 Token Exchange endpoint for urn:ietf:params:oauth:grant-type:token-exchange does not verify that the subject token belongs to the requesting client or that requested scopes remain within the original token's scopes, allowing a low-privilege token to be exchanged for elevated permissions at another application. This issue is fixed in version 4.15.3.

    Published:Jul 10, 2026
    Last Modified:Jul 14, 2026
    EPS:Jul 10, 2026
    EPSS Score:0.00231
    CVSS Score:8.1

    Affected Products

    Vendor
    Zitadel
    Product
    Zitadel

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

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    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