CVE-2026-63521: Microsoft Office Word Information Disclosure Vulnerability
Microsoft Office Word Information Disclosure Vulnerability
Other sources
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5565.1000Patch KB5002901 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in https://aka.ms/OfficeSecurityReleases
Event History
Frequently Asked Questions
What is the severity of CVE-2026-63521?
The severity of CVE-2026-63521 is medium with a score of 5.5.
How do I fix CVE-2026-63521?
To fix CVE-2026-63521, ensure that you update Microsoft Office Word to the latest version provided by Microsoft.
What type of vulnerability is CVE-2026-63521?
CVE-2026-63521 is an information disclosure vulnerability due to an out-of-bounds read.
Who is affected by CVE-2026-63521?
CVE-2026-63521 affects Microsoft Office Word 2016, Microsoft 365 Apps for Enterprise, and various versions of Microsoft Office LTSC and Office 2019.
What does CVE-2026-63521 allow an attacker to do?
CVE-2026-63521 allows an unauthorized attacker to disclose information locally.