Security advisory

{
  "id": "a015e8848ea72933711c0ef02d47dcd07396828af8009386e542d59a734a07ae",
  "url": "https://osv.dev/vulnerability/CVE-2021-20195",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-20195",
    "summary": "A flaw was found in keycloak in versions before 13.0.0. A Self Stored XSS attack vector escalating to a complete account takeover is possible due to user-supplied data fields not being properly encoded and Javascript code being used to process the data. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
    "evidence": "osv:CVE-2021-20195",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-20195",
      "aliases": [
        "CVE-2021-20195",
        "GHSA-q6w2-89hq-hq27"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/keycloak/keycloak",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0bb3d0d8a692521b7c43961ee44e2c910cab1d1f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "12.0.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "12.0.2",
            "12.0.1",
            "12.0.0",
            "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-2021-20195.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:24.334156068Z",
      "provider": "osv",
      "references": [
        "https://bugzilla.redhat.com/show_bug.cgi?id=1919143"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-20195",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 431125,
  "published_at": "2021-05-28T11:15:07.867+00:00"
}