Security advisory

{
  "id": "5bcf4d6ce9b944041c5b2a70f756754b7ee26917f145bdc33d016b4d8b970e5e",
  "url": "https://osv.dev/vulnerability/CVE-2021-4143",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-4143",
    "summary": "Cross-site Scripting (XSS) - Generic in GitHub repository bigbluebutton/bigbluebutton prior to 2.4.0.",
    "evidence": "osv:CVE-2021-4143",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-4143",
      "aliases": [
        "CVE-2021-4143"
      ],
      "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/bigbluebutton/bigbluebutton",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "72d5e54e3eb3cd442d23dc097158fe81f1efda82"
                },
                {
                  "fixed": "62040bdcb3c2f993ba72ab89f4db2015e18d1706"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.4.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "62040bdcb3c2f993ba72ab89f4db2015e18d1706"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.4-rc-7",
            "v2.4-rc-6",
            "v2.4-rc-5",
            "v2.4-rc-4",
            "v2.4-rc-3",
            "2.4-rc-2",
            "v2.4-rc-1",
            "v2.4-beta-4",
            "v2.4-beta-3",
            "v2.4-beta-2",
            "v2.4-beta-1",
            "v2.4-alpha-1",
            "v2.3.1",
            "v2.3.0",
            "v2.3-rc-2",
            "v2.3-rc-1",
            "v2.3-beta-5",
            "v2.3-beta-4",
            "v2.3-beta-3",
            "v2.3-beta-2",
            "v2.3-beta-1",
            "v2.3-alpha-8",
            "v2.3-alpha-7",
            "v2.3-alpha-6",
            "v2.3-alpha-5",
            "v2.3-alpha-4",
            "v2.3-alpha-3",
            "v2.3-alpha-2",
            "v2.3-alpha-1",
            "2.2-rc-3",
            "2.2-rc-2",
            "2.2-rc-1",
            "2.2-beta-23",
            "2.2-beta-22",
            "2.2-beta-21",
            "2.2-beta-20",
            "2.2-beta-19",
            "2.2-beta-18",
            "2.2-beta-17",
            "2.2-beta-16",
            "2.2-beta-15",
            "2.2-beta-14",
            "2.2-beta-12",
            "2.2-beta-11",
            "2.2-beta-10",
            "2.2-beta-9",
            "2.2-beta-8",
            "2.2-beta-7",
            "2.2-beta-6",
            "2.2-beta-5",
            "2.2-beta-4",
            "2.2-beta-3",
            "2.2-beta-2",
            "dcs-2-a",
            "v0.9.0-beta",
            "v0.8",
            "v0.8rc2",
            "v0.8b4.0",
            "v0.8b4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4143.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:58.353732160Z",
      "provider": "osv",
      "references": [
        "https://github.com/bigbluebutton/bigbluebutton/commit/62040bdcb3c2f993ba72ab89f4db2015e18d1706",
        "https://huntr.dev/bounties/e67603e6-8497-4ab6-b93a-02c26407d443"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-4143",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386594,
  "published_at": "2022-01-19T23:15:08.113+00:00"
}