EUVD-2026-73880
GHSA-4r9f-wq7m-x6mw
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-parse vector requires local execution triggered by user opening a crafted workbook; no system privileges needed, full code execution impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Integer overflow or wraparound in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Integer overflow in Microsoft Excel's file parsing engine allows an unauthenticated attacker who delivers a specially crafted Excel workbook to execute arbitrary code with the privileges of the victim user upon file opening. The vulnerability spans Excel 2016 through Microsoft 365 Apps for Enterprise and LTSC variants on both Windows and macOS. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a specially crafted Excel workbook file using an affected build of Microsoft Excel on Windows or macOS. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 reflects a local attack vector requiring user interaction - the attacker does not reach the parser remotely but must induce the victim to open a malicious file (AV:L/UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft Security Response Center patch referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81949. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit your environment to identify which Excel versions are deployed (prioritize Microsoft 365 Apps for Enterprise, Excel 2016, and LTSC variants) and notify users not to open Excel files from untrusted external sources; consider enabling email gateway filtering to restrict or flag .xls and .xlsx attachments from external domains. …
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Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Buffer Overflow
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External POC / Exploit Code
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