CVE-2026-55026

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

5.5

Vector

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

Exploitability: 1.8 / Impact: 3.6

Source: NVD

Description

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.

Affected (16)

Products: Microsoft: 365 Apps, Microsoft 365, Office 2016, Office 2019, Office 2021, Office 2024, Sharepoint Server

7 products

Sharepoint Server

Configuration A

16 vulnerable

Vulnerable Software	Affected Versions
Microsoft 365 Apps	All versions
Microsoft 365 Apps	All versions
Microsoft Microsoft 365	All versions
Microsoft Office 2016	All versions
Microsoft Office 2016	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 Sharepoint Server	Before 16.0.19725.20434
Microsoft Sharepoint Server	Version 2016
Microsoft Sharepoint Server	Version 2019

Related CWEs

Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55026

Source: secure@microsoft.com

PatchVendor Advisory

Timeline

No history available yet.