Security advisory

{
  "id": "911b0f250c2c6feaf4842af418676f80c09f9f7f2b16c823af76e351f200436d",
  "url": "https://osv.dev/vulnerability/CVE-2021-27237",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-27237",
    "summary": "The admin panel in BlackCat CMS 1.3.6 allows stored XSS (by an admin) via the Display Name field to backend/preferences/ajax_save.php.",
    "evidence": "osv:CVE-2021-27237",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-27237",
      "aliases": [
        "CVE-2021-27237"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/blackcatdevelopment/blackcatcms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c23542f55cba8eaddb3cb34613bed03f7ae758f7"
                },
                {
                  "last_affected": "c23542f55cba8eaddb3cb34613bed03f7ae758f7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:blackcat-cms:blackcat_cms:1.3.6:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.3.6"
                      },
                      {
                        "last_affected": "1.3.6"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.3.6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27237.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:35.066916205Z",
      "provider": "osv",
      "references": [
        "https://github.com/BlackCatDevelopment/BlackCatCMS/commits/release-1.4/upload/backend/preferences/ajax_save.php",
        "https://github.com/BlackCatDevelopment/BlackCatCMS/compare/1.3.6...1.4Beta",
        "https://www.exploit-db.com/exploits/49565"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-27237",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385652,
  "published_at": "2021-02-16T19:15:13.01+00:00"
}