What is CVE-2026-26144?

CVE-2026-26144 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Microsoft Excel Information Disclosure Vulnerability

Which CVE IDs does CVE-2026-26144 cover?

CVE-2026-26144 covers the following CVE IDs: CVE-2026-26144. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-26144?

CVE-2026-26144 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-26144?

CVE-2026-26144 affects 2 products, including: Microsoft 365 Apps for Enterprise for 32-bit Systems; Microsoft 365 Apps for Enterprise for 64-bit Systems.

CVE-2026-26144CriticalCVSS 7.5

Microsoft Excel Information Disclosure Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-26144 →

📋 Description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

🎯 Affected products2

Microsoft 365 Apps for Enterprise for 32-bit Systems
Microsoft 365 Apps for Enterprise for 64-bit Systems

✅ Remediation

KBClick to Run (Security Update) — fixed build https://aka.ms/OfficeSecurityReleases

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26144
referencehttps://docs.microsoft.com/en-us/officeupdates/office365-proplus-security-updates