CVE-2026-44818

Microsoft Excel Remote Code Execution Vulnerability

At a glance

Severity: HIGH 7.0
EPSS: EPSS 0.26 % · percentile 18 (2026-10-27)
State: PUBLISHED
Published: 2026-06-09
Updated: 2026-09-24
Assigner: microsoft
NVD status: Modified

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.0	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft
CVSS 3.1	HIGH 7.0	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	NVD · secure@microsoft.com (Secondary)

Weaknesses (CWE)

CWE-362

European references

ENISA EUVD · EUVD-2026-35661
GCVE · GCVE-0-2026-44818

CERT-FR advisories

CERTFR-2026-AVI-0727 — Multiples vulnérabilités dans Microsoft Office · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*
cpe:2.3:a:microsoft:office_online_server:-:*:*:*:*:*:*:*

Affected products

Product	Versions
Microsoft · Microsoft 365 Apps for Enterprise	affected 16.0.1 < https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Excel 2016	affected 16.0.0.0 < 16.0.5556.1001
Microsoft · Microsoft Office 2019	affected 19.0.0 < https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Office 365 for Mac	affected 1.0.0 < 16.110.26061317
Microsoft · Microsoft Office LTSC 2021	affected 16.0.1 < https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Office LTSC 2024	affected 16.0.0 < https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Office LTSC for Mac 2021	affected 16.0.1 < 16.110.26061317
Microsoft · Microsoft Office LTSC for Mac 2024	affected 16.0.0 < 16.110.26061317
Microsoft · Office Online Server	affected 16.0.0.0 < 16.0.10417.20137

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44818

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD