CVE-2026-34401

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.02% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 63.4% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-07-24.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-03-31 21:05Z7 MO AGO

Last updated

2026-04-01 15:53Z7 MO AGO

Reserved

2026-03-27

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 6.5)

CNA CVSS vector

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

Weaknesses

• CWE-611Improper Restriction of XML External Entity ReferenceBase

Data version

5.2

Document digest

7cba90b22476942f3a68e37956de9b7f626a97391bb9742f57996df9c8b1ac06

• github.comhttps://github.com/microsoft/XmlNotepad/security/advisories/GHSA-5j32-486h-42chx_refsource_CONFIRM
• github.comhttps://github.com/microsoft/XmlNotepad/commit/3665603d61ba10b7827a3724e854748cb780140cx_refsource_MISC
• github.comhttps://github.com/microsoft/XmlNotepad/commit/c03ab2311ac6960452eb1ab49098768f851dcc53x_refsource_MISC
• github.comhttps://github.com/microsoft/XmlNotepad/releases/tag/2.9.0.21x_refsource_MISC