Security advisory

{
  "id": "65570b6cdf1b647a7cc4827bb03c7e0c38aa4ce71bed47a8095863f4accc2452",
  "url": "https://osv.dev/vulnerability/CVE-2020-23839",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-23839",
    "summary": "A Reflected Cross-Site Scripting (XSS) vulnerability in GetSimple CMS v3.3.16, in the admin/index.php login portal webpage, allows remote attackers to execute JavaScript code in the client's browser and harvest login credentials after a client clicks a link, enters credentials, and submits the login form.",
    "evidence": "osv:CVE-2020-23839",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-23839",
      "aliases": [
        "CVE-2020-23839"
      ],
      "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/getsimplecms/getsimplecms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e58b89e1efbd7e9cd3c9782c42d7f83ff0e74aad"
                },
                {
                  "last_affected": "e58b89e1efbd7e9cd3c9782c42d7f83ff0e74aad"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:get-simple:getsimple_cms:3.3.16:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.3.16"
                      },
                      {
                        "last_affected": "3.3.16"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.3.16",
            "v3.3.16"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-23839.json"
          }
        }
      ],
      "modified": "2026-10-20T10:49:38.197149402Z",
      "provider": "osv",
      "references": [
        "https://github.com/boku7/CVE-2020-23839",
        "https://www.exploit-db.com/exploits/49726",
        "https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1330"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-23839",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 380626,
  "published_at": "2020-09-01T17:15:12.31+00:00"
}