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TI-2026-31040 Aliases CVE-2026-42831GHSA-vvc2-cg8v-mmjx

Microsoft Office Remote Code Execution Vulnerability

Priority LOW 36CWE-122Published · Updated

Key facts

Attack vector
Local
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 Microsoft.

Summary

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00437 38th percentileScored 2026-11-07
Fix Fixed Microsoft Office for Android (Microsoft): 16.0.19822.20190Microsoft Office LTSC for Mac 2021 (Microsoft): 16.109.26051019+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

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Office for Android16.0.1 to before 16.0.19822.2019016.0.19822.20190Patch availableCNA
MicrosoftMicrosoft Office LTSC for Mac 202116.0.1 to before 16.109.2605101916.109.26051019Patch availableCNA
MicrosoftMicrosoft Office LTSC for Mac 202416.0.0 to before 16.109.2605101916.109.26051019Patch availableCNA
  • Microsoft Office for Android VendorMicrosoft Affected 16.0.1 to before 16.0.19822.20190 Fixed in 16.0.19822.20190 Patch available CNA
  • Microsoft Office LTSC for Mac 2021 VendorMicrosoft Affected 16.0.1 to before 16.109.26051019 Fixed in 16.109.26051019 Patch available CNA
  • Microsoft Office LTSC for Mac 2024 VendorMicrosoft Affected 16.0.0 to before 16.109.26051019 Fixed in 16.109.26051019 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:android:*:*before 16.0.19822.20190VulnerableMicrosoft
cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:macos:*:*2024VulnerableMicrosoft
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*2021VulnerableMicrosoft
  • cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:android:*:* Versions before 16.0.19822.20190 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:macos:*:* Versions 2024 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:* Versions 2021 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft Office for Android (Microsoft) Fixed in 16.0.19822.20190
  • Fix · CNA Microsoft Office LTSC for Mac 2021 (Microsoft) Fixed in 16.109.26051019
  • Fix · CNA Microsoft Office LTSC for Mac 2024 (Microsoft) Fixed in 16.109.26051019

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Unlikely
ProductStatusPlan or fix
Microsoft Office LTSC for Mac 2021Fixed 16.109.26051019 · Security Update
Microsoft Office LTSC for Mac 2024Fixed 16.109.26051019 · Security Update
Microsoft Office for AndroidFixed 16.0.19822.20190 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42831
  2. 2026-10-03 Alias added: GHSA-vvc2-cg8v-mmjx

References

Patch 1

  • TI-2025-37796 GDI+ Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2025-23775 M365 Copilot Information Disclosure Vulnerability CVSS 3.1CRITICAL 9.3
  • TI-2025-33667 GDI+ Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2021-19684 Microsoft Office app Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.6
  • TI-2026-37251 Microsoft M365 Copilot Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.9
  • TI-2026-39054 M365 Copilot Information Disclosure Vulnerability CVSS 3.1CRITICAL 9.8
See all 54 →

Sources

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