CVE-2026-97761Network attack vectorHinoki check available

Unauthenticated code execution via stack-based buffer overflow

Published Oct 13, 2026 · Updated Oct 13, 2026

Stack-based buffer overflow in Microsoft Office Excel allows remote attackers to execute code via network-delivered input. The public CNA record does not identify the affected function or the input operation that overruns the stack buffer, and the referenced vendor page was inaccessible during research. Exploitation requires user interaction but no attacker privileges; the precise interaction and execution context are not disclosed in the retrieved record.

CVSS severity8.8
High
EPSS probability0.78%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Stack-based buffer overflow in Microsoft Office Excel allows remote attackers to execute code via network-delivered input. The public CNA record does not identify the affected function or the input operation that overruns the stack buffer, and the referenced vendor page was inaccessible during research. Exploitation requires user interaction but no attacker privileges; the precise interaction and execution context are not disclosed in the retrieved record.

The record

CVE
CVE-2026-97761
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Microsoft Corporation
Product
Microsoft Office LTSC for Mac 2024
Classifications
CWE-121, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.0.0 <publication

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft Corporation · Microsoft Office LTSC for Mac 2024version=16.0.0 <publication
Microsoft Corporation · Microsoft Office LTSC for Mac 2021version=16.0.1 <publication
Microsoft Corporation · Microsoft Office 365 for Macversion=1.0.0 <publication
Microsoft Corporation · Microsoft Office LTSC 2024version=16.0.0 <16.0.17932.21056
Microsoft Corporation · Microsoft 365 Apps for enterpriseversion=16.0.1 <https://aka.ms/OfficeSecurityReleases

Published CVSS scores

8.8MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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