Published May 12, 2026Sources checked Nov 11, 2026
9.9CRITICALCVSS out of 10
What this means
Review the available evidence
CVE-2026-42898 and is rated Critical severity with a CVSS score of 9.9. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
What to do next
Remediation and response
Microsoft Security Response Center guidance
Vendor revision: May 29, 2026
Install KB5078943.
Vendor-listed releases
9.1.45.11
CISA KEVNot listedBased on the latest collected catalog
EPSS1.2%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-42898?
Improper control of generation of code ('code injection') in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to execute code over a network.