{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.2.6"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "db26d517a066f90f614e45eaf0c3e288a6800e05"
            }
          ],
          "repo": "https://github.com/bigbluebutton/bigbluebutton",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "BigBlueButton before 2.2.6 allows remote attackers to read arbitrary files because the presfilename (lowercase) value can be a .pdf filename while the presFilename (mixed case) value has a ../ sequence. This can be leveraged for privilege escalation via a directory traversal to bigbluebutton.properties. NOTE: this issue exists because of an ineffective mitigation to CVE-2020-12112 in which there was an attempted fix within an NGINX configuration file, without considering that the relevant part of NGINX is case-insensitive.",
  "id": "CVE-2020-12443",
  "modified": "2026-03-13T21:48:16.344865479Z",
  "published": "2020-04-29T02:15:11.467Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/bigbluebutton/bigbluebutton/pull/9259/commits/b21ca8355a57286a1e6df96984b3a4c57679a463"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/mclab-hbrs/BBB-POC"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}