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Severity by source

Vendor (microsoft) PRIMARY
MEDIUM
qualitative
NVD
7.1 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Primary rating from Vendor (microsoft).

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

Lifecycle Timeline

3
Severity Changed
Jul 15, 2026 - 17:22 NVD
MEDIUM HIGH
CVSS changed
Jul 15, 2026 - 17:22 NVD
6.1 (MEDIUM) 7.1 (HIGH)
CVE Published
Jul 14, 2026 - 17:09 cve.org
MEDIUM 6.1

DescriptionNVD

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

Analysis

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

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CVE-2026-55898 vulnerability details – vuln.today

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