Microsoft Office Excel contains a remote code execution vulnerability that could allow an attacker to take complete control of an affected system if a user opens a specially crafted Excel file that includes a malformed object.
Product
Office
Added to KEV
14 Apr 2026
Federal remediation due
28 Apr 2026
Known ransomware use
Not reported
Page history
Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.
More advisories, affected versions and source history
Related advisories and sources
Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.