Security advisory

{
  "id": "265323d3e1973d0282f3dc6e82eda1515b5366fb8128c9ca4f41c7c3f511d1ce",
  "url": "https://osv.dev/vulnerability/CVE-2021-28977",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-28977",
    "summary": "Cross Site Scripting vulnerability in GetSimpleCMS 3.3.16 in admin/upload.php by adding comments or jpg and other file header information to the content of xla, pages, and gzip files,",
    "evidence": "osv:CVE-2021-28977",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-28977",
      "aliases": [
        "CVE-2021-28977"
      ],
      "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/getsimplecms/getsimplecms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "a26202bee203910780f5a96b3bc1f52a8f23d0a1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:get-simple:getsimplecms:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "3.3.15"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.3.15",
            "v3.3.14",
            "v3.3.14b2",
            "v3.3.14b1",
            "3.3.12",
            "v3.3.5",
            "v3.2.2",
            "v3.2.1",
            "v3.1.2",
            "v3.1.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-28977.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:42.559864989Z",
      "provider": "osv",
      "references": [
        "https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1336"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-28977",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384524,
  "published_at": "2021-06-23T13:15:08.18+00:00"
}