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CVE-2026-68807

Microsoft Excel Remote Code Execution Vulnerability

Published: Aug 11, 2026Updated: Aug 13, 2026 Sources: CVE List NVDCWE-122
7.8HIGH
NVD MITRE
EPSS Score
0.3%
Top 76.9%
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-2026-68807 is a Microsoft Excel bug that can let someone run harmful code on your computer if you open a specially crafted Excel file; if you receive unexpected spreadsheets, you should treat this as urgent and update.

Executive summary

CVE-2026-68807 is a Microsoft Excel memory-corruption weakness (CWE-122) that can lead to local remote code execution when a victim opens a malicious Excel file, without needing any login beforehand.

If affected, business impact
Full computer compromiseMalware installationData theft riskRansomware risk

What to do now

  1. Check whether any affected Microsoft Office/Excel apps on your business devices are at or below the fixed versions (Windows Excel: 16.0.5565.1001; Mac Office/Excel: 16.112.26081010; Office Online Server: 16.0.10417.20175).
  2. Update Microsoft Excel/Microsoft Office (including Microsoft 365 Apps) to the fixed builds listed by Microsoft for CVE-2026-68807.
  3. For devices where patching is delayed, block or quarantine unexpected spreadsheet files from email and downloads (especially files from new or untrusted senders) until updates are applied.
  4. After updating, verify your version number changed to the fixed build on each endpoint and review email/security logs for suspicious Excel attachments.
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 Office LTSC 2021Desktop App
Consumer Software / productivity
Microsoft Office 365 for MacOn-premDesktop App
Consumer Software / productivity
Microsoft Office LTSC for Mac 2021On-premDesktop App
Consumer Software / productivity
Microsoft Office LTSC for Mac 2024On-premDesktop App
Consumer Software / productivity
Office Online ServerOn-premWeb App
Enterprise Software / collaboration-groupware
microsoft 365SaaSSaaS Service
Cloud & SaaS / saas-application
and 7 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-68807?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-2026-68807
msrc.microsoft.com
News mentions
2

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