CVE-2026-34401 in Microsoft XmlNotepad

Zusammenfassung (Englisch)

XML Notepad is a Windows program that provides a simple intuitive User Interface for browsing and editing XML documents. Prior to version 2.9.0.21, XML Notepad does not disable DTD processing by default which means external entities are resolved automatically. There is a well known attack related to malicious DTD files where an attacker to craft a malicious XML file that loads a DTD that causes XML Notepad to make outbound HTTP/SMB requests, potentially leaking local file contents or capturing the victim's NTLM credentials. This issue has been patched in version 2.9.0.21.

Zuständig

GitHub_M

Reservieren

27.03.2026

Veröffentlichung

01.04.2026

Einträge

VulDB provides additional information and datapoints for this CVE:

ID	Schwachstelle	CWE	Aus	Mas	CVE
354585	Microsoft XmlNotepad HTTP/SMB XML External Entity	611	Nicht definiert	Offizieller Fix	CVE-2026-34401