CVE-2026-81401

Microsoft Excel Information Disclosure Vulnerability

At a glance

Severity: MEDIUM 5.5
EPSS: EPSS 0.54 % · percentile 45 (2026-10-27)
State: PUBLISHED
Published: 2026-09-08
Updated: 2026-10-14
Assigner: microsoft
NVD status: Analyzed

Description

Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C	microsoft
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N	NVD · secure@microsoft.com (Secondary)

Weaknesses (CWE)

CWE-843

European references

ENISA EUVD · EUVD-2026-73861
GCVE · GCVE-0-2026-81401

CERT-FR advisories

CERTFR-2026-AVI-1145 — 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_2016:-:*:*:*:-:*:x64:*
cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x86:*
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:*:*:*:*:*:*:*:* < 16.0.10417.20207

Affected products

Product	Versions
Microsoft · Microsoft 365 Apps for Enterprise	affected 16.0.1 < 16.0.20326.20138
Microsoft · Microsoft Excel 2016	affected 16.0.0.0 < 16.0.5569.1003
Microsoft · Microsoft Office 2016	affected 16.0.0 < 16.0.5569.1003
Microsoft · Microsoft Office 2019	affected 19.0.0 < 16.0.10417.20207
Microsoft · Microsoft Office 365 for Mac	affected 1.0.0 < 16.113.26091433
Microsoft · Microsoft Office LTSC 2021	affected 16.0.1 < 16.0.14334.20906
Microsoft · Microsoft Office LTSC 2024	affected 16.0.0 < 16.0.17932.20976
Microsoft · Microsoft Office LTSC for Mac 2021	affected 16.0.1 < 16.113.26091433
Microsoft · Microsoft Office LTSC for Mac 2024	affected 16.0.0 < 16.113.26091433
Microsoft · Office Online Server	affected 16.0.0.0 < 16.0.10417.20207

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81401

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