Security advisory

{
  "id": "0e1dc822cd8b45f018edecf9632a6227bf0edf70d53513f6ce35ba9c7b5f165d",
  "url": "https://osv.dev/vulnerability/CVE-2021-41465",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-41465",
    "summary": "Cross-site scripting (XSS) vulnerability in concrete/elements/collection_theme.php in concrete5-legacy 5.6.4.0 and below allows remote attackers to inject arbitrary web script or HTML via the rel parameter.",
    "evidence": "osv:CVE-2021-41465",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-41465",
      "aliases": [
        "CVE-2021-41465"
      ],
      "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/concretecms/concrete5-legacy",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "150aa366297a75f76ea372484e7d3ab634021127"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:concrete5-legacy_project:concrete5-legacy:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "5.6.4.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.6.4.0",
            "5.6.3.5",
            "5.6.3.4",
            "5.6.3.3",
            "5.6.3.2",
            "5.6.3.1",
            "5.6.3",
            "5.6.2.1",
            "5.6.2",
            "5.6.1.2",
            "5.6.1.1",
            "5.6.1",
            "5.6.0.1",
            "5.6.0.2",
            "5.6.0",
            "5.5.2.1",
            "5.5.2",
            "5.5.1",
            "5.5.0",
            "5.4.2.2",
            "5.4.2.1",
            "5.4.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41465.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:00.354048617Z",
      "provider": "osv",
      "references": [
        "https://github.com/concrete5/concrete5-legacy",
        "https://github.com/concrete5/concrete5-legacy/issues/2006"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-41465",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384812,
  "published_at": "2021-10-01T16:15:08.1+00:00"
}