{"id":"CVE-2026-83607","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-83607","summary":"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…","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.","published":"2026-09-01T14:23:58.797Z","modified":"2026-09-01T14:23:58.797Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/xmldom/xmldom/pull/1043","label":"xmldom/xmldom#1043"},"references":[{"type":"WEB","url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-w2rr-34g9-rvrj"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/pull/1043"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/pull/1050"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44"},{"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"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-01T14:23:58.797Z"}}