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          "names": [
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          "organization": "Independent Security Researcher"
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      "cve": "CVE-2026-4636",
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          "category": "description",
          "text": "A flaw was found in Keycloak. An authenticated user with the uma_protection role can bypass User-Managed Access (UMA) policy validation. This allows the attacker to include resource identifiers owned by other users in a policy creation request, even if the URL path specifies an attacker-owned resource. Consequently, the attacker gains unauthorized permissions to victim-owned resources, enabling them to obtain a Requesting Party Token (RPT) and access sensitive information or perform unauthorized actions.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "keycloak: Keycloak: UMA policy bypass allows authenticated users to gain unauthorized access to victim-owned resources.",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Important vulnerability in Keycloak allows an authenticated user with the `uma_protection` role to bypass User-Managed Access (UMA) policy validation. Exploitation requires that victim users have created UMA-protected resources with `ownerManagedAccess` enabled and that authorization services are enabled on the client. This flaw enables an attacker to gain unauthorized permissions to victim-owned resources within Red Hat Build of Keycloak.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:1a7ac3c798d83cc37dd750ed44223630f4ebff937534a59a9e9ad029dbf31a0f_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:715a5c6cc9061fc0305370a33f5b69a96ba7bfdb23b706a567b489fc05b05e06_ppc64le",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:c68d195c2d19568d9789648ef347a3388da453c83120d696453333c34a564347_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:33fc8c6edb3c5c2df302ea53a89454320e08ff4660ba84d0a78f6c67178dfb16_s390x",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:a4cb583985eb220ad05b1983a98a5a50e2b76c15e6f56152045591e3994f37d1_ppc64le",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:c1c1cb36f70ca142a789b359f9a120d321f58adc44e2c97a49c2d6f270d15bd9_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:dc54248ad9357fbd737e6983e6d8d0c7e845e39ed6558bd7c39f7a7573459489_amd64"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:6478"
        },
        {
          "category": "vendor_fix",
          "date": "2026-04-02T13:53:32+00:00",
          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.",
          "product_ids": [
            "Red Hat build of Keycloak 26.2.15"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:6475"
        },
        {
          "category": "vendor_fix",
          "date": "2026-04-02T13:54:47+00:00",
          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.",
          "product_ids": [
            "Red Hat build of Keycloak 26.4.11"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:6477"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
          "product_ids": [
            "9Base-RHBK-26.2:rhbk/keycloak-operator-bundle@sha256:d80f27078e17321d4b194820a9c325c47b8cc3e431ac37c84a6c5b2b52b009e6_amd64",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9-operator@sha256:1880e406eab1303dd1faa08694ff2cb33901e1e69272a2f9cdf5f5af6941bd84_arm64",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9-operator@sha256:31378e237970d0c5c483ec2dd3de6a39adfb7cdfe13c5d106be39088859271e6_amd64",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9-operator@sha256:47fa46896eda2f3c51657f6bc9a024d63f3d306f4726ead3fa46ef5796696e07_ppc64le",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9-operator@sha256:6c0c1d05bb893e1d598ffc5e953f1287d36e78f6b1938c430e0bc19e22343ae4_s390x",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:10b97dd8e38ce50457a121e53d53472877cc3aa185e7c4b23da191c00e914af2_arm64",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:4065d584a57daa2aa2259afa19844f6308e2f6a252b08738c809002cc84aa606_s390x",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:4c4f3e098f715efc174a4a01803b7133ca7c2b744ea4b8151c7edcae608d9531_ppc64le",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:b3fe3f4c74e96a2daf735fe5e8df98b2fa6f023cfda0c7cd4915a83556e14efb_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-operator-bundle@sha256:7fb041b0e2b43954c3a83b58fd885b1cdc5bb32275e06c4c72955da5b78255c3_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:0d90a1c28652b5f73ea90f78968548178cf710121fcb13774a467aeb9c30ab09_s390x",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:1a7ac3c798d83cc37dd750ed44223630f4ebff937534a59a9e9ad029dbf31a0f_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:715a5c6cc9061fc0305370a33f5b69a96ba7bfdb23b706a567b489fc05b05e06_ppc64le",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:c68d195c2d19568d9789648ef347a3388da453c83120d696453333c34a564347_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:33fc8c6edb3c5c2df302ea53a89454320e08ff4660ba84d0a78f6c67178dfb16_s390x",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:a4cb583985eb220ad05b1983a98a5a50e2b76c15e6f56152045591e3994f37d1_ppc64le",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:c1c1cb36f70ca142a789b359f9a120d321f58adc44e2c97a49c2d6f270d15bd9_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:dc54248ad9357fbd737e6983e6d8d0c7e845e39ed6558bd7c39f7a7573459489_amd64",
            "Red Hat build of Keycloak 26.2.15",
            "Red Hat build of Keycloak 26.4.11"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "9Base-RHBK-26.2:rhbk/keycloak-operator-bundle@sha256:d80f27078e17321d4b194820a9c325c47b8cc3e431ac37c84a6c5b2b52b009e6_amd64",
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            "9Base-RHBK-26.2:rhbk/keycloak-rhel9-operator@sha256:47fa46896eda2f3c51657f6bc9a024d63f3d306f4726ead3fa46ef5796696e07_ppc64le",
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            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:10b97dd8e38ce50457a121e53d53472877cc3aa185e7c4b23da191c00e914af2_arm64",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:4065d584a57daa2aa2259afa19844f6308e2f6a252b08738c809002cc84aa606_s390x",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:4c4f3e098f715efc174a4a01803b7133ca7c2b744ea4b8151c7edcae608d9531_ppc64le",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:b3fe3f4c74e96a2daf735fe5e8df98b2fa6f023cfda0c7cd4915a83556e14efb_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-operator-bundle@sha256:7fb041b0e2b43954c3a83b58fd885b1cdc5bb32275e06c4c72955da5b78255c3_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:0d90a1c28652b5f73ea90f78968548178cf710121fcb13774a467aeb9c30ab09_s390x",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:1a7ac3c798d83cc37dd750ed44223630f4ebff937534a59a9e9ad029dbf31a0f_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:715a5c6cc9061fc0305370a33f5b69a96ba7bfdb23b706a567b489fc05b05e06_ppc64le",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:c68d195c2d19568d9789648ef347a3388da453c83120d696453333c34a564347_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:33fc8c6edb3c5c2df302ea53a89454320e08ff4660ba84d0a78f6c67178dfb16_s390x",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:a4cb583985eb220ad05b1983a98a5a50e2b76c15e6f56152045591e3994f37d1_ppc64le",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:c1c1cb36f70ca142a789b359f9a120d321f58adc44e2c97a49c2d6f270d15bd9_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:dc54248ad9357fbd737e6983e6d8d0c7e845e39ed6558bd7c39f7a7573459489_amd64",
            "Red Hat build of Keycloak 26.2.15",
            "Red Hat build of Keycloak 26.4.11"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important",
          "product_ids": [
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            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:4065d584a57daa2aa2259afa19844f6308e2f6a252b08738c809002cc84aa606_s390x",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:4c4f3e098f715efc174a4a01803b7133ca7c2b744ea4b8151c7edcae608d9531_ppc64le",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:b3fe3f4c74e96a2daf735fe5e8df98b2fa6f023cfda0c7cd4915a83556e14efb_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-operator-bundle@sha256:7fb041b0e2b43954c3a83b58fd885b1cdc5bb32275e06c4c72955da5b78255c3_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:0d90a1c28652b5f73ea90f78968548178cf710121fcb13774a467aeb9c30ab09_s390x",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:1a7ac3c798d83cc37dd750ed44223630f4ebff937534a59a9e9ad029dbf31a0f_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:715a5c6cc9061fc0305370a33f5b69a96ba7bfdb23b706a567b489fc05b05e06_ppc64le",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:c68d195c2d19568d9789648ef347a3388da453c83120d696453333c34a564347_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:33fc8c6edb3c5c2df302ea53a89454320e08ff4660ba84d0a78f6c67178dfb16_s390x",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:a4cb583985eb220ad05b1983a98a5a50e2b76c15e6f56152045591e3994f37d1_ppc64le",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:c1c1cb36f70ca142a789b359f9a120d321f58adc44e2c97a49c2d6f270d15bd9_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:dc54248ad9357fbd737e6983e6d8d0c7e845e39ed6558bd7c39f7a7573459489_amd64",
            "Red Hat build of Keycloak 26.2.15",
            "Red Hat build of Keycloak 26.4.11"
          ]
        }
      ],
      "title": "keycloak: Keycloak: UMA policy bypass allows authenticated users to gain unauthorized access to victim-owned resources."
    }
  ]
}