CVE-2026-63525

Published: Aug 11, 2026Modified: Aug 13, 2026

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Affected (10)

Products: Microsoft: 365 Apps, Office 2019, Office 2021, Office 2024, Word

5 products

Configuration A

10 vulnerable

Vulnerable Software	Affected Versions
Microsoft 365 Apps	All versions
Microsoft 365 Apps	All versions
Microsoft Office 2019	All versions
Microsoft Office 2019	All versions
Microsoft Office 2021	All versions
Microsoft Office 2021	All versions
Microsoft Office 2024	All versions
Microsoft Office 2024	All versions
Microsoft Word	Version 2016
Microsoft Word	Version 2016

Related CWEs

Numeric Truncation Error

Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63525

Source: secure@microsoft.com

PatchVendor Advisory

Timeline

No history available yet.