CVE-2026-81950

Code execution via double-free memory corruption

Published Sep 8, 2026 · Updated Sep 9, 2026

Double-free memory corruption in Microsoft Office Excel allows attackers to execute code locally after a user opens a crafted file. Microsoft identifies Excel as the affected component but does not disclose the allocation or parsing routine that frees the same memory twice. Exploitation requires user interaction and yields code execution in the user's security context; no remote service is exposed.

CVSS severity7.8
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Double-free memory corruption in Microsoft Office Excel allows attackers to execute code locally after a user opens a crafted file. Microsoft identifies Excel as the affected component but does not disclose the allocation or parsing routine that frees the same memory twice. Exploitation requires user interaction and yields code execution in the user's security context; no remote service is exposed.

The record

CVE
CVE-2026-81950
Published
Sep 8, 2026
Updated
Sep 9, 2026
Vendor
Microsoft
Product
Microsoft Office LTSC for Mac 2024
Classifications
CWE-415, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=-

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Office LTSC for Mac 2024version=-
Microsoft · Microsoft Office 2016version=16.0.0 <16.0.5569.1003
Microsoft · Microsoft Office 2019version=19.0.0 <16.0.10417.20207
Microsoft · Microsoft Excel 2016version=16.0.0.0 <16.0.5569.1003
Microsoft · Microsoft Office LTSC for Mac 2021version=-
Microsoft · Microsoft Office 365 for Macversion=-
Microsoft · Microsoft Office LTSC 2021version=16.0.1 <16.0.14334.20906
Microsoft · Microsoft Office LTSC 2024version=16.0.0 <16.0.17932.20976
Microsoft · Microsoft 365 Apps for enterpriseversion=16.0.1 <16.0.20326.20138

Published CVSS scores

7.8MicrosoftCVSS:3.1/AV:L/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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
T1204.002User Execution: Malicious File
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo