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CVE-2026-68816: Microsoft Excel Remote Code Execution Vulnerability

highCVSS 7.8CVE-2026-68816
Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CSIRTS triage

vendor: Microsoftproduct: Microsoft Office ExcelMemory corruptionRemote code execution
What
Stack-based buffer overflow in Microsoft Office Excel allows code execution when opening untrusted files locally.
Who is affected
Users opening untrusted Excel files on systems with Microsoft Office installed.
Urgency
High priority; RCE through file handling with high CVSS (7.8); requires user interaction.
Action
Apply Microsoft security patch immediately; educate users to avoid opening untrusted Excel files.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68816

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-68816coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Microsoft Excel Remote

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center