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CVE-2026-34401

MEDIUM

6.5

Description

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.

Details CVE

Score CVSS v3.16.5

SeveriteMEDIUM

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurREQUIRED

Publie3/31/2026

Derniere modification4/1/2026

Sourcenvd

Observations honeypot0

Faiblesses (CWE)

CWE-611

References

https://github.com/microsoft/XmlNotepad/commit/3665603d61ba10b7827a3724e854748cb780140c(security-advisories@github.com)

https://github.com/microsoft/XmlNotepad/commit/c03ab2311ac6960452eb1ab49098768f851dcc53(security-advisories@github.com)

https://github.com/microsoft/XmlNotepad/releases/tag/2.9.0.21(security-advisories@github.com)

https://github.com/microsoft/XmlNotepad/security/advisories/GHSA-5j32-486h-42ch(security-advisories@github.com)

https://github.com/microsoft/XmlNotepad/security/advisories/GHSA-5j32-486h-42ch(134c704f-9b21-4f2e-91b3-4a467353bcc0)

Correlations IOC

Aucune correlation enregistree

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