Medium 6.5Published Oct 13, 2026

CVE-2026-88154Microsoft Office Excel Information Disclosure Vulnerability

Updated under an hour ago (Oct 26, 2026, 4:23 PM ET)

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It affects Microsoft 365 Apps for Enterprise and 7 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
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 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	NVD
microsoft office_2024 microsoft:office_2024	all versions; all versions	NVD

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88154	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.