TI-2026-73154 Aliases CVE-2026-97741 GHSA-5jhx-6vrg-fq93

Heap buffer overflow in Microsoft Excel enables remote code execution

MEDIUM 42CWE-122Published 2026-10-13 · Updated 2026-10-31

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

Microsoft 365 Apps for Enterprise, Office 365 for Mac, and Office LTSC for Mac 2021 and 2024 are affected. Office 365 for Mac is affected from 1.0.0 before 16.114.26101123, and Office LTSC for Mac 2021 from 16.0.1 before 16.114.26101123. A heap-based buffer overflow (CWE-122) in Excel lets an unauthorized remote attacker execute code. Exploitation requires user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00929 60th percentileScored 2026-11-07

Fix Fixed Microsoft 365 Apps for Enterprise (Microsoft): https://aka.ms/OfficeSecurityReleasesMicrosoft Office 365 for Mac (Microsoft): 16.114.26101123+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Microsoft	Microsoft 365 Apps for Enterprise	16.0.1 to before https://aka.ms/OfficeSecurityReleases	https://aka.ms/OfficeSecurityReleases	Patch available	CNA
Microsoft	Microsoft Office 365 for Mac	1.0.0 to before 16.114.26101123	16.114.26101123	Patch available	CNA
Microsoft	Microsoft Office LTSC for Mac 2021	16.0.1 to before 16.114.26101123	16.114.26101123	Patch available	CNA
Microsoft	Microsoft Office LTSC for Mac 2024	16.0.0 to before 16.114.26101123	16.114.26101123	Patch available	CNA

Microsoft 365 Apps for Enterprise VendorMicrosoft Affected 16.0.1 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
Microsoft Office 365 for Mac VendorMicrosoft Affected 1.0.0 to before 16.114.26101123 Fixed in 16.114.26101123 Patch available CNA
Microsoft Office LTSC for Mac 2021 VendorMicrosoft Affected 16.0.1 to before 16.114.26101123 Fixed in 16.114.26101123 Patch available CNA
Microsoft Office LTSC for Mac 2024 VendorMicrosoft Affected 16.0.0 to before 16.114.26101123 Fixed in 16.114.26101123 Patch available CNA

CPE configurations NVD · 5

CPE	Versions	Role	Vendor
cpe:2.3:a:microsoft:365_apps:-::::enterprise::x64:*	not specified by NVD	Vulnerable	Microsoft
cpe:2.3:a:microsoft:365_apps:-::::enterprise::x86:*	not specified by NVD	Vulnerable	Microsoft
cpe:2.3:a:microsoft:microsoft_365:-:::::macos::	not specified by NVD	Vulnerable	Microsoft
cpe:2.3:a:microsoft:office_2021:-::::ltsc:macos:-:	not specified by NVD	Vulnerable	Microsoft
cpe:2.3:a:microsoft:office_2024:-::::ltsc:macos:-:	not specified by NVD	Vulnerable	Microsoft

cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:* Versions not specified by NVD Vulnerable ·Microsoft
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:* Versions not specified by NVD Vulnerable ·Microsoft
cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:* Versions not specified by NVD Vulnerable ·Microsoft
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:* Versions not specified by NVD Vulnerable ·Microsoft
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:* Versions not specified by NVD Vulnerable ·Microsoft

Remediation

Office 365 for Mac and Office LTSC for Mac 2021 and 2024 are fixed in 16.114.26101123. Microsoft 365 Apps for Enterprise is fixed in the release listed on the Microsoft Office security releases page.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fix · CNA Microsoft 365 Apps for Enterprise (Microsoft) Fixed in https://aka.ms/OfficeSecurityReleases
Fix · CNA Microsoft Office 365 for Mac (Microsoft) Fixed in 16.114.26101123
Fix · CNA Microsoft Office LTSC for Mac 2021 (Microsoft) Fixed in 16.114.26101123
Fix · CNA Microsoft Office LTSC for Mac 2024 (Microsoft) Fixed in 16.114.26101123

Timeline

2026-10-13 Threatist record created from CVE-2026-97741
2026-10-13 Alias added: GHSA-5jhx-6vrg-fq93
2026-10-14 Priority changed: LOW → MEDIUM
2026-10-16 Fix available: Microsoft/Microsoft Office 365 for [email protected], Microsoft/Microsoft Office LTSC for Mac [email protected], Microsoft/Microsoft Office LTSC for Mac [email protected] · CNA

References

Patch 1

Microsoft Office Excel Remote Code Execution Vulnerability

TI-2024-14173 Microsoft Outlook Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2023-09240 Microsoft Outlook Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2024-25471 Microsoft Project Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 8.8
TI-2023-17652 Microsoft Outlook Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
TI-2026-17368 Microsoft Word Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 7.8
TI-2026-17363 Microsoft Office Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 7.8

See all 935 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences