CVE-2026-83607

Описание

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.

A flaw was found in xmldom, a JavaScript module for parsing and serializing XML. This vulnerability allows a remote attacker to inject malicious content, such as attributes or elements, into serialized XML or HTML documents. This occurs because the Document.createElement() function does not properly validate element names, and the XMLSerializer.serializeToString() function then outputs these unvalidated names directly. When these manipulated documents are processed by a web browser, it can lead to cross-site scripting (XSS), enabling attackers to execute arbitrary scripts in the user's browser.