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CVE-2026-34401

MEDIUM

6.5

Descricao

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.

Detalhes CVE

Pontuacao CVSS v3.16.5

SeveridadeMEDIUM

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

Vetor de ataqueNETWORK

ComplexidadeLOW

Privilegios necessariosNONE

Interacao do usuarioREQUIRED

Publicado3/31/2026

Ultima modificacao4/1/2026

Fontenvd

Avistamentos honeypot0

Fraquezas (CWE)

CWE-611

Referencias

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)

Correlacoes IOC

Sem correlacoes registradas

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