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CVE-2026-55055

HIGH

7.8

CVSS 3.1

Metadata

CVE ID: CVE-2026-55055
State: PUBLISHED
Assigner: microsoft
Reserved: 2026-06-16 14:13 UTC
Published: 2026-07-14 17:08 UTC
Last updated: 2026-07-14 19:28 UTC
Primary CWE: CWE-121
CWE-121: Stack-based Buffer Overflow
Vendor / Product: Microsoft / Microsoft 365 Apps for Enterprise
Sources: cve.org · NVD

Severity & Metrics

7.8 HIGH CVSS 3.1

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

Affected products (11)

Vendor	Product	Platform	Versions
Microsoft	Microsoft 365 Apps for Enterprise	32-bit Systems,x64-based Systems	16.0.1 < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office 2019	32-bit Systems,x64-based Systems	19.0.0 < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office 365 for Mac	—	1.0.0 < 16.111.26071215
Microsoft	Microsoft Office LTSC 2021	32-bit Systems,x64-based Systems	16.0.1 < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office LTSC 2024	32-bit Systems,x64-based Systems	16.0.0 < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office LTSC for Mac 2021	—	16.0.1 < 16.111.26071215
Microsoft	Microsoft Office LTSC for Mac 2024	—	16.0.0 < 16.111.26071215
Microsoft	Microsoft SharePoint Enterprise Server 2016	x64-based Systems	16.0.0 < 16.0.5561.1001
Microsoft	Microsoft SharePoint Server 2019	x64-based Systems	16.0.0 < 16.0.10417.20175
Microsoft	Microsoft SharePoint Server Subscription Edition	x64-based Systems	16.0.0 < 16.0.19725.20434
Microsoft	Microsoft Word 2016	32-bit Systems,x64-based Systems	16.0.1 < 16.0.5561.1000

Weakness (CWE)

CWE	Source	Description
CWE-121	cna	CWE-121: Stack-based Buffer Overflow

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.8	HIGH	3.1	cna	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

References (1)

Microsoft Word Remote Code Execution Vulnerability https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55055

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