Security advisory

{
  "id": "9ae2cb573a2a385bedca38b7bacf75db6f96ec50dbb379654a7a5b723b83eda1",
  "url": "https://osv.dev/vulnerability/CVE-2021-42567",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-42567",
    "summary": "Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.",
    "evidence": "osv:CVE-2021-42567",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-42567",
      "aliases": [
        "CVE-2021-42567",
        "GHSA-gfhx-jjwq-63gv"
      ],
      "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/apereo/cas",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d930aeac61a911fbde6db6bbce244d22086b996d"
                },
                {
                  "fixed": "8be70c8ee43f1a90738fe189b98b2366b9c256b2"
                },
                {
                  "introduced": "a55c2c0ecf4cea3f2a2377c3df2c852369fac8b3"
                },
                {
                  "fixed": "2cba0f0cc54e9cf5bcdae7382ded8685dfc3ce44"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.3.0"
                      },
                      {
                        "fixed": "6.3.7.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.4.0"
                      },
                      {
                        "fixed": "6.4.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v6.4.1",
            "v6.3.7",
            "v6.4.0",
            "v6.3.6",
            "v6.3.5",
            "v6.3.4",
            "v6.3.3",
            "v6.3.2",
            "v6.3.1",
            "v6.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-42567.json"
          }
        }
      ],
      "modified": "2026-10-20T10:55:00.823040383Z",
      "provider": "osv",
      "references": [
        "https://github.com/apereo/cas/releases",
        "https://apereo.github.io/2021/10/18/restvuln/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-42567",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386678,
  "published_at": "2021-12-07T22:15:06.907+00:00"
}