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MEDIUM · 6.5

CVE-2026-55054

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

Vulnerability Description

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

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE

Affected Products

VendorProductVersions
Microsoft365 Apps-
MicrosoftExcel2016
MicrosoftOffice2019
MicrosoftOffice 2021< 16.111.26071215
MicrosoftOffice 2024< 16.111.26071215
MicrosoftOffice Online Server< 16.0.10417.20175
MicrosoftOffice 365< 16.111.26071215
AppleMacos-

Related Weaknesses (CWE)

CWE-125

References

FAQ

What is CVE-2026-55054?

CVE-2026-55054 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

How severe is CVE-2026-55054?

CVE-2026-55054 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-55054?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft 365 Apps, Microsoft Excel, Microsoft Office, Microsoft Office 2021, Microsoft Office 2024.