CVE-2026-44822

Microsoft Excel Information Disclosure Vulnerability

CVE-2026-44822 is fixed in 3 products on 1 platform, first by KB5002877, released June 9, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.2

Important

Exploitation

None reported

Exploitation Unlikely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0052

44th percentile

<p>Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Excel 2016 (32-bit edition)	KB5002877	Jun 9, 2026
Microsoft Excel 2016 (64-bit edition)	KB5002877	Jun 9, 2026
Office Online Server	KB5002875	Jun 9, 2026

Details

Published
June 9, 2026
Weakness
Out-of-bounds Read
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44822

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