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CVE-2026-68794

Microsoft Excel Remote Code Execution Vulnerability

Published: Aug 11, 2026Updated: Aug 13, 2026 Sources: CVE List NVDCWE-122
7.8HIGH
NVD MITRE
EPSS Score
0.4%
Top 71.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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

In plain language

AI Act now

CVE-2026-68794 is a Microsoft Excel/Office flaw where a specially made file can cause harmful code to run on your computer when a user opens it; because Microsoft has a fix, typical small businesses should patch promptly.

Executive summary

CVE-2026-68794 is a heap-based buffer overflow in Microsoft Office Excel that can lead to local code execution after a user opens a crafted file (unauthorized attacker, but requires user interaction).

If affected, business impact
Malware running on workstationsData theft from Office filesBusiness disruption from compromiseWider ransomware risk

What to do now

  1. Check which Microsoft products you run (Microsoft Excel/Microsoft Office, Microsoft 365 Apps, Office on the Mac, and/or Office Online Server) and the installed version/build.
  2. Verify whether your build is below the fixed versions listed by Microsoft (Windows/Excel fixed in 16.0.5565.1001; Mac fixed in 16.112.26081010; Office Online Server fixed in 16.0.10417.20175).
  3. Update Microsoft Office/Microsoft Excel to the fixed release for your product using Microsoft’s Office security release guidance (Microsoft 365 Apps and Microsoft Office use the Microsoft OfficeSecurityReleases update path).
  4. For any devices you can’t update immediately, restrict users from opening files from untrusted email/links and isolate any workstation that receives suspicious Office documents until updates are applied.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:LAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-122

Affected Products

Microsoft
commercial·US
Microsoft 365 Apps for EnterpriseDesktop App
Consumer Software / productivity
Microsoft Excel 2016Desktop App
Consumer Software / productivity
microsoft 365SaaSSaaS Service
Cloud & SaaS / saas-application
office 2019On-premDesktop App
Consumer Software / productivity
office 2021On-premDesktop App
Consumer Software / productivity
office 2024On-premDesktop App
Consumer Software / productivity
Microsoft Office LTSC 2021Desktop App
Consumer Software / productivity
Microsoft Office 365 for MacOn-premDesktop App
Consumer Software / productivity
and 7 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-68794?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68794
msrc.microsoft.com
News mentions
4

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