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.
INFO
Published Date :
2026-03-31T21:05:50.647Z
Last Modified :
2026-04-01T15:53:18.538Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-34401 vulnerability.
| Vendors | Products |
|---|---|
| Microsoft |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-34401.
