{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "0.6.0"
              },
              {
                "introduced": "0.7.0"
              },
              {
                "fixed": "0.8.14"
              },
              {
                "introduced": "0.9.0"
              },
              {
                "fixed": "0.9.11"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "introduced": "c568938641cc1f121cef5b4df80fcfda1e489b6e"
            },
            {
              "introduced": "8c7c7afe89027641aa59c101d20eefedc0f54c6f"
            },
            {
              "fixed": "8a83f8ebf53604a733cb580bfc4ff9c0ae014d92"
            },
            {
              "fixed": "1f0610959ab7b82cc7ad702d1be0243efc5791c0"
            },
            {
              "fixed": "cba1321218b069182695813fa7565653708e172e"
            },
            {
              "fixed": "d8212e632507eaf1d9f609657dd4c56abeb12d44"
            }
          ],
          "repo": "https://github.com/xmldom/xmldom",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-w2rr-34g9-rvrj"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-91"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83607.json"
  },
  "details": "xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14 and 0.9.11, and in xmldom version 0.6.0 and earlier, Document.createElement(tagName) stores an unvalidated element name and XMLSerializer.serializeToString() emits that name verbatim. The requireWellFormed: true path did not validate the element qualified name or synthesized xmlns:PREFIX declaration, so attacker-controlled tag names could inject attributes, elements, or processing instructions into serialized XML or HTML and could cause cross-site scripting when browser-consumed. The unchecked values violate the XML QName constraint, and default serialization and creation-time createElement() behavior remain permissive. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.",
  "id": "CVE-2026-83607",
  "modified": "2026-09-03T03:30:44.101448766Z",
  "published": "2026-09-01T14:23:58.797Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/releases/tag/0.8.14"
    },
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/releases/tag/0.9.11"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83607.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-w2rr-34g9-rvrj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-83607"
    },
    {
      "type": "FIX",
      "url": "https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44"
    },
    {
      "type": "FIX",
      "url": "https://github.com/xmldom/xmldom/pull/1043"
    },
    {
      "type": "FIX",
      "url": "https://github.com/xmldom/xmldom/pull/1050"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "xmldom: Element name injection via createElement() bypasses requireWellFormed"
}