Security advisory

{
  "id": "9c63034bdecab7f2bf9e2f736106ce726e37fb8f5613695cc84f394abf1439a9",
  "url": "https://osv.dev/vulnerability/CVE-2021-21673",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-21673",
    "summary": "Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.",
    "evidence": "osv:CVE-2021-21673",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-21673",
      "aliases": [
        "CVE-2021-21673",
        "GHSA-2vvr-5757-qp87"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/jenkinsci/cas-plugin",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "1eb260f65e6fa43290aad220bd4ac334c1948585"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:jenkins:cas:*:*:*:*:*:jenkins:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.6.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "cas-plugin-1.6.0",
            "cas-plugin-1.5.0",
            "cas-plugin-1.4.3",
            "cas-plugin-1.4.2",
            "cas-plugin-1.4.1",
            "cas-plugin-1.4.0",
            "cas-plugin-1.3.0",
            "cas-plugin-1.2.0",
            "cas-plugin-1.1.2",
            "cas-plugin-1.1.1",
            "cas-plugin-1.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21673.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:27.597389670Z",
      "provider": "osv",
      "references": [
        "https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2387"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-21673",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 431870,
  "published_at": "2021-06-30T17:15:09.16+00:00"
}