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    2 vulnerabilities found for XmlNotepad by microsoft

    CVE-2026-34401 (GCVE-0-2026-34401)

    Vulnerability from nvd – Published: 2026-03-31 21:05 – Updated: 2026-04-01 15:53
    VLAI
    Title
    XML Notepad: XML External Entity (XXE) Injection via Unsafe XmlTextReader in XML Diff and Schema Loading
    Summary
    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.
    Severity
    6.5 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-611 - Improper Restriction of XML External Entity Reference
    Assigner
    References
    Impacted products
    Vendor Product Version
    microsoft XmlNotepad Affected: < 2.9.0.21
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-34401 (GCVE-0-2026-34401)

    Vulnerability from cvelistv5 – Published: 2026-03-31 21:05 – Updated: 2026-04-01 15:53
    VLAI
    Title
    XML Notepad: XML External Entity (XXE) Injection via Unsafe XmlTextReader in XML Diff and Schema Loading
    Summary
    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.
    Severity
    6.5 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-611 - Improper Restriction of XML External Entity Reference
    Assigner
    References
    Impacted products
    Vendor Product Version
    microsoft XmlNotepad Affected: < 2.9.0.21
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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