xmldom up to 0.8.13/0.9.10/0.6.0 Attribute Element.setAttribute Name cross site scripting

Summaryinfo

A vulnerability categorized as problematic has been discovered in xmldom up to 0.8.13/0.9.10/0.6.0. The affected element is the function Element.setAttribute of the component Attribute Handler. Executing a manipulation of the argument Name can lead to cross site scripting. This vulnerability appears as CVE-2026-83605. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in xmldom up to 0.8.13/0.9.10/0.6.0 and classified as problematic. This vulnerability affects the function Element.setAttribute of the component Attribute Handler. The manipulation of the argument name with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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, Element.setAttribute() calls the private _createAttribute(name) path without validating the attribute name, while Document.createAttribute(name) validates against QName. XMLSerializer.serializeToString() emits attribute names verbatim, and requireWellFormed: true did not validate them, so a crafted name can terminate the intended attribute and inject additional attributes, including event handlers, into browser-consumed output; synthesized xmlns:PREFIX declarations expose the same unchecked-name boundary. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.

The advisory is available at github.com. This vulnerability was named CVE-2026-83605 since 08/31/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 0.8.14 or 0.9.11 eliminates this vulnerability.

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Productinfo

Name

• xmldom

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6.0
• 0.8.0
• 0.8.1
• 0.8.2
• 0.8.3
• 0.8.4
• 0.8.5
• 0.8.6
• 0.8.7
• 0.8.8
• 0.8.9
• 0.8.10
• 0.8.11
• 0.8.12
• 0.8.13
• 0.9.0
• 0.9.1
• 0.9.2
• 0.9.3
• 0.9.4
• 0.9.5
• 0.9.6
• 0.9.7
• 0.9.8
• 0.9.9
• 0.9.10

Website

• Product: https://github.com/xmldom/xmldom/

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