High 8.8Published Oct 13, 2026

CVE-2026-97773Microsoft Office Excel Remote Code Execution Vulnerability

Updated under an hour ago (Oct 26, 2026, 5:23 PM ET)

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It affects Microsoft 365 Apps for Enterprise and 10 other products. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.84%, higher than 58% of scored CVEs.

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Exploited in the last 30 days

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Weakness (CWE): CWE-122
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.84% (percentile 58)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 13, 2026

Affected products

Affected products

Microsoft Microsoft 365 Apps for Enterprise microsoft:365_apps_for_enterprise (from the name)	from 16.0.1 before https://aka.ms/OfficeSecurityReleases	CNA record
Microsoft Microsoft Office 365 for Mac microsoft:office_365_for_mac (from the name)	from 1.0.0 before 16.114.26101123	CNA record
Microsoft Microsoft Office LTSC 2021 microsoft:office_ltsc_2021 (from the name)	from 16.0.1 before 16.0.14334.20974	CNA record
Microsoft Microsoft Office LTSC 2024 microsoft:office_ltsc_2024 (from the name)	from 16.0.0 before 16.0.17932.21056	CNA record
Microsoft Microsoft Office LTSC for Mac 2021 microsoft:office_ltsc_for_mac_2021 (from the name)	from 16.0.1 before 16.114.26101123	CNA record
Microsoft Microsoft Office LTSC for Mac 2024 microsoft:office_ltsc_for_mac_2024 (from the name)	from 16.0.0 before 16.114.26101123	CNA record
Microsoft Office Online Server microsoft:office_online_server (from the name)	from 16.0.0.0 before 16.0.10417.20228	CNA record
microsoft 365_apps microsoft:365_apps	all versions; all versions	NVD
microsoft microsoft_365 microsoft:microsoft_365	all versions	NVD
microsoft office_2021 microsoft:office_2021	all versions; all versions; all versions	NVD
1–10 of 12

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97773	vendor-advisory, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.