What is CVE-2026-88154?

CVE-2026-88154 is a medium-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-10-13.

How severe is CVE-2026-88154?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Out-of-bounds Read in Microsoft 365 Apps For Enterprise

CVE-2026-88154

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

Vulnerability class: Buffer Overflow

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

Microsoft Office Excel Information Disclosure Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-88154?: CVE-2026-88154 is a medium-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-10-13.
How severe is CVE-2026-88154?: Medium severity. CVSS v3 base score is 6.5 out of 10.