{"id":"CVE-2026-83607","state":"PUBLISHED","title":"xmldom: Element name injection via createElement() bypasses requireWellFormed","description":"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.","publishedAt":"2026-09-01T14:23:58.797Z","updatedAt":"2026-09-01T15:28:37.947Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["xmldom xmldom","@xmldom xmldom"],"affected":[{"vendor":"xmldom","product":"xmldom","versions":[{"version":"<= 0.6.0","status":"affected"}]},{"vendor":"@xmldom","product":"xmldom","versions":[{"version":">= 0.7.0, < 0.8.14","status":"affected"},{"version":">= 0.9.0, < 0.9.11","status":"affected"}]}],"references":["https://github.com/xmldom/xmldom/security/advisories/GHSA-w2rr-34g9-rvrj","https://github.com/xmldom/xmldom/pull/1043","https://github.com/xmldom/xmldom/pull/1050","https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e","https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44","https://github.com/xmldom/xmldom/releases/tag/0.8.14","https://github.com/xmldom/xmldom/releases/tag/0.9.11"],"weaknesses":["CWE-91"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/83xxx/CVE-2026-83607.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-83607","state":"PUBLISHED","datePublished":"2026-09-01T14:23:58.797Z","dateUpdated":"2026-09-01T15:28:37.947Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-31T20:36:25.743Z"},"containers":{"cna":{"title":"xmldom: Element name injection via createElement() bypasses requireWellFormed","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"xmldom","product":"xmldom","versions":[{"version":"<= 0.6.0","status":"affected"}]},{"vendor":"@xmldom","product":"xmldom","versions":[{"version":">= 0.7.0, < 0.8.14","status":"affected"},{"version":">= 0.9.0, < 0.9.11","status":"affected"}]}],"references":[{"url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-w2rr-34g9-rvrj","name":"https://github.com/xmldom/xmldom/security/advisories/GHSA-w2rr-34g9-rvrj","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/xmldom/xmldom/pull/1043","name":"https://github.com/xmldom/xmldom/pull/1043","tags":["x_refsource_MISC"]},{"url":"https://github.com/xmldom/xmldom/pull/1050","name":"https://github.com/xmldom/xmldom/pull/1050","tags":["x_refsource_MISC"]},{"url":"https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e","name":"https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e","tags":["x_refsource_MISC"]},{"url":"https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44","name":"https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44","tags":["x_refsource_MISC"]},{"url":"https://github.com/xmldom/xmldom/releases/tag/0.8.14","name":"https://github.com/xmldom/xmldom/releases/tag/0.8.14","tags":["x_refsource_MISC"]},{"url":"https://github.com/xmldom/xmldom/releases/tag/0.9.11","name":"https://github.com/xmldom/xmldom/releases/tag/0.9.11","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-91","lang":"en","description":"CWE-91: XML Injection (aka Blind XPath Injection)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-01T14:23:58.797Z"},"source":{"advisory":"GHSA-w2rr-34g9-rvrj","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-w2rr-34g9-rvrj","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-01T15:28:20.162507Z","id":"CVE-2026-83607","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-01T15:28:37.947Z"}}]}}}