BigBlueButton Stored Cross-site Scripting vulnerability at Guest Lobby

{
  "id": "3d66a58be5948aa35fdde404cc66f952edea448d04b022ddc334e11fe624bcea",
  "url": "https://osv.dev/vulnerability/CVE-2023-43797",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "BigBlueButton Stored Cross-site Scripting vulnerability at Guest Lobby",
    "summary": "BigBlueButton is an open-source virtual classroom. Prior to versions 2.6.11 and 2.7.0-beta.3, Guest Lobby was vulnerable to cross-site scripting when users wait to enter the meeting due to inserting unsanitized messages to the element using unsafe innerHTML. Text sanitizing was added for lobby messages starting in versions 2.6.11 and 2.7.0-beta.3. There are no known workarounds.",
    "evidence": "osv:CVE-2023-43797",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-43797",
      "aliases": [
        "CVE-2023-43797",
        "GHSA-v6wg-q866-h73x"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/bigbluebutton/bigbluebutton",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "304bc851a00558f99a908880f4ac44234a074c9d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.6.11"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "304bc851a00558f99a908880f4ac44234a074c9d"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.6.10",
            "v2.6.9",
            "v2.6.8",
            "v2.6.7",
            "v2.6.6",
            "v2.6.5",
            "v2.6.4",
            "v2.6.3",
            "v2.6.2",
            "v2.6.1",
            "v2.6.0",
            "v2.6.0-rc.9",
            "v2.6.0-rc.7",
            "v2.6.0-rc.6",
            "v2.6.0-rc.4",
            "v2.6.0-rc.5",
            "v2.6.0-rc.1",
            "v2.6.0-rc.3",
            "v2.6.0-rc.2",
            "v2.6.0-beta.7",
            "v2.6.0-beta.6",
            "v2.6.0-beta.5",
            "v2.6.0-beta.4",
            "v2.6.0-beta.3",
            "v2.6.0-beta.2",
            "v2.6.0-beta.1",
            "v2.6.0-alpha.4",
            "v2.6.0-alpha.3",
            "v2.6.0-alpha.2",
            "v2.6.0-alpha.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-2023-43797.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.616033807Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43797.json",
        "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73x",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-43797",
        "https://github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9d",
        "https://github.com/bigbluebutton/bigbluebutton/pull/18392"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43797.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-43797",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517816,
  "published_at": "2023-10-30T22:18:11.821+00:00"
}