{"id":"CVE-2026-83607","summary":"xmldom: Element name injection via createElement() bypasses requireWellFormed","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.","aliases":["GHSA-w2rr-34g9-rvrj"],"modified":"2026-10-28T02:30:33.406077713Z","published":"2026-09-01T14:23:58.797Z","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"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/xmldom/xmldom","events":[{"introduced":"0"},{"last_affected":"c80a161172cc4d8733583bf0cf59abfa589f6d9e"},{"introduced":"c568938641cc1f121cef5b4df80fcfda1e489b6e"},{"fixed":"8a83f8ebf53604a733cb580bfc4ff9c0ae014d92"},{"introduced":"8c7c7afe89027641aa59c101d20eefedc0f54c6f"},{"fixed":"1f0610959ab7b82cc7ad702d1be0243efc5791c0"},{"fixed":"cba1321218b069182695813fa7565653708e172e"},{"fixed":"d8212e632507eaf1d9f609657dd4c56abeb12d44"}],"database_specific":{"extracted_events":[{"strategy":"StringRangeExpression","range":[{"introduced":"0"},{"last_affected":"0.6.0"}],"source":"AFFECTED_FIELD"},{"strategy":"StringRangeExpression","range":[{"introduced":"0.7.0"},{"fixed":"0.8.14"}],"source":"AFFECTED_FIELD"},{"range":[{"introduced":"0.9.0"},{"fixed":"0.9.11"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"fixed":"cba1321218b069182695813fa7565653708e172e"}],"source":"REFERENCES_COMMIT"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"d8212e632507eaf1d9f609657dd4c56abeb12d44"}]},{"original_tag":"0.8.14","range":[{"fixed":"8a83f8ebf53604a733cb580bfc4ff9c0ae014d92"}],"source":"REFERENCES_TAG"},{"range":[{"fixed":"1f0610959ab7b82cc7ad702d1be0243efc5791c0"}],"source":"REFERENCES_TAG","original_tag":"0.9.11"}]}}],"versions":["0.8.13","0.9.10","0.9.9","0.8.12","0.8.11","0.8.10","0.9.8","0.9.7","0.9.6","0.9.5","0.9.4","0.9.3","0.9.2","0.9.1","0.9.0","0.8.9","0.8.8","0.8.7","0.8.6","0.8.5","0.8.4","0.8.3","0.8.2","0.8.1","0.8.0","0.7.3","0.7.2","0.7.1","0.7.0+scoped","v0.7.0","0.7.0+unscoped","0.7.0","0.6.0","0.5.0","0.4.0","0.3.0","0.2.1","0.2.0","v0.1.28-xmldom-alpha","v0.1.28-not-published","xmldom-aplha@v0.1.28","v0.1.27","0.1.27","0.1.26","0.1.25","0.1.24","0.1.23","0.1.22","0.1.21","0.1.20","0.1.19","0.1.18","0.1.17","0.1.2","0.1.1","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-83607.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","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"}]}