BIT-keycloak-2026-11800

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    BIT-keycloak-2026-11800

    Published: 25 Aug 2026Last Modified: 3 Nov 2026

    Summary: Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion

    Details: A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.

    References: https://access.redhat.com/errata/RHSA-2026:30083, https://access.redhat.com/errata/RHSA-2026:30084, https://access.redhat.com/security/cve/CVE-2026-11800, https://bugzilla.redhat.com/show_bug.cgi?id=2487006, https://nvd.nist.gov/vuln/detail/CVE-2026-11800, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-11800.json

    Affected packages

    Package

    Name: keycloak

    Purl: pkg:bitnami/keycloak

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 26.6.0
    Fixed -26.6.4

    Affected versions

    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
    BIT-keycloak-2026-11800 | CVE-DB