CVE-2026-55124

Published: Jul 14, 2026Modified: Jul 16, 2026

5.5

Vector

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

Exploitability: 1.8 / Impact: 3.6

Source: secure@microsoft.com (Secondary)

Description

Improper validation of specified type of input in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Affected (17)

Products: Microsoft: 365 Apps, Microsoft 365, Office 2019, Office 2021, Office 2024, Office Online Server, Sharepoint Server, Word

8 products

Office Online Server

Sharepoint Server

Configuration A

17 vulnerable

Vulnerable Software	Affected Versions
Microsoft 365 Apps	All versions
Microsoft 365 Apps	All versions
Microsoft Microsoft 365	All versions
Microsoft Office 2019	All versions
Microsoft Office 2019	All versions
Microsoft Office 2021	All versions
Microsoft Office 2021	All versions
Microsoft Office 2021	All versions
Microsoft Office 2024	All versions
Microsoft Office 2024	All versions
Microsoft Office 2024	All versions
Microsoft Office Online Server	Before 16.0.10417.20175
Microsoft Sharepoint Server	Before 16.0.19725.20434
Microsoft Sharepoint Server	Version 2016
Microsoft Sharepoint Server	Version 2019
Microsoft Word	Version 2016
Microsoft Word	Version 2016

Related CWEs

Improper Validation of Specified Type of Input

The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.

Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55124

Source: secure@microsoft.com

Vendor AdvisoryPatch

Timeline

No history available yet.