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Vulnerability record · CVE-2026-81393 · published 8 September 2026

CVE-2026-81393: Microsoft 365 apps out-of-bounds read vulnerability

Microsoft · 365 Apps

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

5.5 CVSS 3.1 Medium EPSS 0.54% · top 56.8% CWE-125 · Out-of-bounds read
5.5CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
1References
17 Sep 2026Last modified by NVD

Description

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

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81393 PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-81393), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.