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CVE-2026-66806 Details

Off-by-one error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CNA: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

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URL	Source(s)	Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66806	[email protected]	Vendor Advisory

CWE-ID	CWE Name	Source
CWE-125	Out-of-bounds Read	[email protected]
CWE-193	Off-by-one Error	[email protected]

Product	Versions
microsoft 365 apps	All versions
CPE cpe:2.3:a:microsoft:365_apps:-::::enterprise::x64:* cpe:2.3:a:microsoft:365_apps:-::::enterprise::x86:* Remediation No remediation found in references.
microsoft office 2019	All versions
CPE cpe:2.3:a:microsoft:office_2019:-::::::x64: cpe:2.3:a:microsoft:office_2019:-::::::x86: Remediation No remediation found in references.
microsoft office 2021	All versions
CPE cpe:2.3:a:microsoft:office_2021:-::::ltsc:-:x64: cpe:2.3:a:microsoft:office_2021:-::::ltsc:-:x86: Remediation No remediation found in references.
microsoft office 2024	All versions
CPE cpe:2.3:a:microsoft:office_2024:-::::ltsc:-:x64: cpe:2.3:a:microsoft:office_2024:-::::ltsc:-:x86: Remediation No remediation found in references.
microsoft word	2016
CPE cpe:2.3:a:microsoft:word:2016::::::x64: cpe:2.3:a:microsoft:word:2016::::::x86: Remediation No remediation found in references.

3 change records found show changes

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