CVE intelligence

CVE-2026-45455

Vulnerability intelligence

Published Jun 9, 2026Sources checked Nov 12, 2026

4.3MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-45455 and is rated Medium severity with a CVSS score of 4.3. 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: Jun 19, 2026

Vendor remediation details

Click to Run Release Notes Install KB5002875. Install KB5002877.

Vendor-listed releases

16.0.10417.20137
https://aka.ms/OfficeSecurityReleases
16.110.26061317
16.0.5556.1001

CISA KEVNot listedBased on the latest collected catalog

EPSS0.6%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-45455?

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Source: NVD