Security advisory

{
  "id": "3b01ce08ad86727cc24ce351d0e60f5bcca03896756357419a39c21c36d1730a",
  "url": "https://osv.dev/vulnerability/CVE-2020-27826",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-27826",
    "summary": "A flaw was found in Keycloak before version 12.0.0 where it is possible to update the user's metadata attributes using Account REST API. This flaw allows an attacker to change its own NameID attribute to impersonate the admin user for any particular application.",
    "evidence": "osv:CVE-2020-27826",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-27826",
      "aliases": [
        "CVE-2020-27826",
        "GHSA-m9cj-v55f-8x26"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/keycloak/keycloak",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2690229863ddbcdfa2c75e00a7a9858e2e03c6c9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "12.0.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.4.0.Test",
            "1.3.0.Final",
            "1.1.0.Beta2",
            "1.0.0.Final",
            "1.0-final",
            "1.0-rc-1",
            "1.0-beta-4",
            "1.0-beta-2",
            "1.0-beta-1",
            "1.0-alpha-3",
            "1.0-alpha-2",
            "1.0-alpha-1",
            "1.0-alpha-1-12062013"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-27826.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:14.624968540Z",
      "provider": "osv",
      "references": [
        "https://bugzilla.redhat.com/show_bug.cgi?id=1905089"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:redhat:single_sign-on:7.4.4:*:*:*:*:*:*:*",
              "cpe:2.3:a:redhat:single_sign-on:7.4:*:*:*:*:*:*:*"
            ],
            "vendor_product": "redhat:single_sign-on",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "7.4"
                  },
                  {
                    "last_affected": "7.4"
                  },
                  {
                    "introduced": "7.4.4"
                  },
                  {
                    "last_affected": "7.4.4"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-27826",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429086,
  "published_at": "2021-05-28T11:15:07.67+00:00"
}