TI-2026-73306 Aliases CVE-2026-102849 GHSA-cm8g-f3c2-3wrg

Microsoft Office Access heap buffer overflow allows remote code execution

MEDIUM 41CWE-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 Office Access versions listed in the affected products are vulnerable to a heap-based buffer overflow, CWE-122, in which a flaw in memory handling lets data be written past the end of a heap buffer. An unauthorized remote attacker can execute code over a network, but user interaction is required. The flaw is not listed in CISA KEV and no public exploit is linked in the references.

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

Description from the CNA

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00769 55th percentileScored 2026-11-07

Fix Fixed Microsoft 365 Apps for Enterprise (Microsoft): https://aka.ms/OfficeSecurityReleasesMicrosoft Office LTSC 2021 (Microsoft): 16.0.14334.20974+1 more product

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 LTSC 2021	16.0.1 to before 16.0.14334.20974	16.0.14334.20974	Patch available	CNA
Microsoft	Microsoft Office LTSC 2024	16.0.0 to before 16.0.17932.21056	16.0.17932.21056	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 LTSC 2021 VendorMicrosoft Affected 16.0.1 to before 16.0.14334.20974 Fixed in 16.0.14334.20974 Patch available CNA
Microsoft Office LTSC 2024 VendorMicrosoft Affected 16.0.0 to before 16.0.17932.21056 Fixed in 16.0.17932.21056 Patch available CNA

CPE configurations NVD · 6

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

Remediation

Microsoft 365 Apps for Enterprise is fixed by the update listed in Microsoft's Office security releases reference. Microsoft Office LTSC 2021 is fixed in version 16.0.14334.20974. Microsoft Office LTSC 2024 is fixed in version 16.0.17932.21056.

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 LTSC 2021 (Microsoft) Fixed in 16.0.14334.20974
Fix · CNA Microsoft Office LTSC 2024 (Microsoft) Fixed in 16.0.17932.21056

Timeline

2026-10-13 Threatist record created from CVE-2026-102849
2026-10-13 Alias added: GHSA-cm8g-f3c2-3wrg
2026-10-14 CISA SSVC decision points changed
2026-10-14 Priority changed: MEDIUM → LOW
2026-10-14 Priority changed: LOW → MEDIUM
2026-10-25 EPSS moved to the 50th–90th percentile

References

Patch 1

Microsoft Office Access 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