CVE-2026-81396
Microsoft Excel Remote Code Execution Vulnerability
HIGH
7.8
CVSS Score
Published: September 8, 2026 at 05:18 PM UTC
Updated: October 31, 2026 at 04:17 PM UTC
9 products affected across 1 vendor365 AppsOffice 2021Office 2019
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Severity
HIGH7.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit
Description
Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 16.0.20326.20138, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.113.26091433, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.5569.1003, so it looks safe — our inference, not a vendor statement
All versions
All versions16.0.0
Affected range stops below 16.0.5569.1003, so it looks safe — our inference, not a vendor statement
All versions19.0.0
Affected range stops below 16.0.10417.20207, so it looks safe — our inference, not a vendor statement
All versions16.0.1
Affected range stops below 16.0.14334.20906, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.113.26091433, so it looks safe — our inference, not a vendor statement
All versions16.0.0
Affected range stops below 16.0.17932.20976, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.113.26091433, so it looks safe — our inference, not a vendor statement
1.0.0 ≤ v < 16.113.26091433
Affected range stops below 16.113.26091433, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81396SSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.8HIGHmicrosoft
Vector?
Quick Info
StatusANALYZED
CWE
CWE-121CWE-193
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