Is CVE-2026-34401 actively exploited?

No active exploitation of CVE-2026-34401 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34401 be exploited remotely?

Yes. CVE-2026-34401 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34401?

CVE-2026-34401 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-34401

CWE-611Published: March 31, 2026· Updated: Apr 1, 2026

6.5

CVSS v3.1

EPSS:0.22%probability of exploitation in 30 daysPercentile:45.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-34401 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.