CVE-2026-55138

Published: Jul 14, 2026Modified: Jul 15, 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

Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Affected (14)

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

7 products

Office Online Server

Configuration A

14 vulnerable

Vulnerable Software	Affected Versions
Microsoft 365 Apps	All versions
Microsoft 365 Apps	All versions
Microsoft Excel	Version 2016
Microsoft Excel	Version 2016
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

Related CWEs

Untrusted Pointer Dereference

The product obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55138

Source: secure@microsoft.com

Vendor Advisory

Timeline

No history available yet.