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CVE-2026-77898 Details

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code over a network.

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

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URL	Source(s)	Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77898	[email protected]	PatchVendor Advisory

CWE-ID	CWE Name	Source
CWE-122	Heap-based Buffer Overflow	[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 microsoft 365	All versions
CPE cpe:2.3:a:microsoft:microsoft_365:-:::::macos:: 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: cpe:2.3:a:microsoft:office_2021:-::::ltsc:macos:-: 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: cpe:2.3:a:microsoft:office_2024:-::::ltsc:macos:-: Remediation No remediation found in references.

5 change records found show changes

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