Security advisory

{
  "id": "5d8d3a175760bd36bc839b560225b76b01145dcf5cd5074f802f56c6788cae24",
  "url": "https://osv.dev/vulnerability/CVE-2020-27838",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-27838",
    "summary": "A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.",
    "evidence": "osv:CVE-2020-27838",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-27838",
      "aliases": [
        "CVE-2020-27838",
        "GHSA-pcv5-m2wh-66j3"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/keycloak/keycloak",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "af1855ebc6a3d025b58b697c9bc32567fb512eec"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "13.0.0"
                      }
                    ],
                    "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-2020-27838.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:02.096182383Z",
      "provider": "osv",
      "references": [
        "https://bugzilla.redhat.com/show_bug.cgi?id=1906797"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "redhat:single_sign-on",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "7.0"
                  },
                  {
                    "last_affected": "7.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-27838",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 439941,
  "published_at": "2021-03-08T22:15:13.423+00:00"
}