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TI-2026-54539 Aliases CVE-2026-78439GHSA-6cw8-rp4c-jfpf

Microsoft Office Graphics Component Remote Code Execution Vulnerability

Priority MEDIUM 42CWE-121Published · Updated

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 Microsoft.

Summary

Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00837 57th percentileScored 2026-11-07
Fix Fixed Microsoft Office 365 for Mac (Microsoft): 16.113.26091433Microsoft Office for Android (Microsoft): 16.0.20430.20000+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

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Office 365 for Mac1.0.0 to before 16.113.2609143316.113.26091433Patch availableCNA
MicrosoftMicrosoft Office for Android16.0.1 to before 16.0.20430.2000016.0.20430.20000Patch availableCNA
MicrosoftMicrosoft Office LTSC for Mac 202116.0.1 to before 16.113.2609143316.113.26091433Patch availableCNA
MicrosoftMicrosoft Office LTSC for Mac 202416.0.0 to before 16.113.2609143316.113.26091433Patch availableCNA
  • Microsoft Office 365 for Mac VendorMicrosoft Affected 1.0.0 to before 16.113.26091433 Fixed in 16.113.26091433 Patch available CNA
  • Microsoft Office for Android VendorMicrosoft Affected 16.0.1 to before 16.0.20430.20000 Fixed in 16.0.20430.20000 Patch available CNA
  • Microsoft Office LTSC for Mac 2021 VendorMicrosoft Affected 16.0.1 to before 16.113.26091433 Fixed in 16.113.26091433 Patch available CNA
  • Microsoft Office LTSC for Mac 2024 VendorMicrosoft Affected 16.0.0 to before 16.113.26091433 Fixed in 16.113.26091433 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:*:*:*——Microsoft
  • cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:*:*:* Versions — — ·Microsoft

Remediation

  • Fix · CNA Microsoft Office 365 for Mac (Microsoft) Fixed in 16.113.26091433
  • Fix · CNA Microsoft Office for Android (Microsoft) Fixed in 16.0.20430.20000
  • Fix · CNA Microsoft Office LTSC for Mac 2021 (Microsoft) Fixed in 16.113.26091433
  • Fix · CNA Microsoft Office LTSC for Mac 2024 (Microsoft) Fixed in 16.113.26091433

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
Microsoft Office 365 for MacFixed 16.113.26091433 · Security Update
Microsoft Office LTSC for Mac 2021Fixed 16.113.26091433 · Security Update
Microsoft Office LTSC for Mac 2024Fixed 16.113.26091433 · Security Update
Microsoft Office for AndroidFixed 16.0.20430.20000 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-78439
  2. 2026-10-03 Alias added: GHSA-6cw8-rp4c-jfpf

References

Patch 1

  • TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
See all 18045 →

Sources

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