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CVE-2026-68817: Microsoft Excel Remote Code Execution Vulnerability

highCVSS 7.8CVE-2026-68817
Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CSIRTS triage

vendor: Microsoftproduct: Office ExcelRemote code execution
What
A stack-based buffer overflow in Microsoft Office Excel allows unauthorized attackers to execute code locally.
Who is affected
All users opening untrusted or crafted Excel files with affected versions are at risk.
Urgency
High severity (CVSS 7.8) local code execution via file handling; prompt patching is essential.
Action
Update Microsoft Office Excel to the latest patched version.

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-2026-68817

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-2026-68817coverage & 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