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Vulnerability record · CVE-2026-55898 · published 14 July 2026

CVE-2026-55898: 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.

7.1 CVSS 3.1 High EPSS 0.47% · top 61.6% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
1References
15 Jul 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:H

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-2026-55898 Vendor Advisory

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

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Source: NIST National Vulnerability Database (record CVE-2026-55898), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.