CVE Explorer
CVE-2026-34401
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 t
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"XmlNotepad","vendor":"microsoft","versions":[{"status":"affected","version":"< 2.9.0.21"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:cf2c81676a9be7bdd89f588e861e54fcefe483cb996c8997f2a4c32ad64b7ae5 · sha256:7cba90b22476942f… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:cf2c81676a9be7bdd89f588e861e54fcefe483cb996c8997f2a4c32ad64b7ae5 · sha256:7cba90b22476942f… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-611","description":"CWE-611: Improper Restriction of XML External Entity Reference","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:cf2c81676a9be7bdd89f588e861e54fcefe483cb996c8997f2a4c32ad64b7ae5 · sha256:7cba90b22476942f… · /containers/cna/problemTypes/0/descriptions/0
Source references
5 source assertions{"name":"https://github.com/microsoft/XmlNotepad/commit/3665603d61ba10b7827a3724e854748cb780140c","tags":["x_refsource_MISC"],"url":"https://github.com/microsoft/XmlNotepad/commit/3665603d61ba10b7827a3724e854748cb780140c"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:cf2c81676a9be7bdd89f588e861e54fcefe483cb996c8997f2a4c32ad64b7ae5 · sha256:7cba90b22476942f… · /containers/cna/references/1
{"name":"https://github.com/microsoft/XmlNotepad/commit/c03ab2311ac6960452eb1ab49098768f851dcc53","tags":["x_refsource_MISC"],"url":"https://github.com/microsoft/XmlNotepad/commit/c03ab2311ac6960452eb1ab49098768f851dcc53"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:cf2c81676a9be7bdd89f588e861e54fcefe483cb996c8997f2a4c32ad64b7ae5 · sha256:7cba90b22476942f… · /containers/cna/references/2
{"name":"https://github.com/microsoft/XmlNotepad/releases/tag/2.9.0.21","tags":["x_refsource_MISC"],"url":"https://github.com/microsoft/XmlNotepad/releases/tag/2.9.0.21"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:cf2c81676a9be7bdd89f588e861e54fcefe483cb996c8997f2a4c32ad64b7ae5 · sha256:7cba90b22476942f… · /containers/cna/references/3
{"tags":["exploit"],"url":"https://github.com/microsoft/XmlNotepad/security/advisories/GHSA-5j32-486h-42ch"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:cf2c81676a9be7bdd89f588e861e54fcefe483cb996c8997f2a4c32ad64b7ae5 · sha256:7cba90b22476942f… · /containers/adp/0/references/0
{"name":"https://github.com/microsoft/XmlNotepad/security/advisories/GHSA-5j32-486h-42ch","tags":["x_refsource_CONFIRM"],"url":"https://github.com/microsoft/XmlNotepad/security/advisories/GHSA-5j32-486h-42ch"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:cf2c81676a9be7bdd89f588e861e54fcefe483cb996c8997f2a4c32ad64b7ae5 · sha256:7cba90b22476942f… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.