{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "3.3.15"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "a26202bee203910780f5a96b3bc1f52a8f23d0a1"
            }
          ],
          "repo": "https://github.com/getsimplecms/getsimplecms",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "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,",
  "id": "CVE-2021-28977",
  "modified": "2026-03-13T21:53:40.585965671Z",
  "published": "2021-06-23T13:15:08.180Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1336"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}