Vulnerability · NVD

CVE-2026-21511

CVE-2026-21511, high severity (CVSS 7.5): 3 tracked apps concerned, all fixed or indeterminable on their current version.

Severity (CVSS): 7.5
Exploitation: 3.6 %
Tracked apps: 3
Still exposed: 0

Published on 2026-02-10

Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Attack vector : Network No privileges required No user interaction

Show raw CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS 3.64% above median percentile 88.7%

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

Microsoft Office macOS brew:cask:microsoft-office

Affected - Fixed in - Latest tracked 16.112.26082125 undetermined
Microsoft Word macOS com.microsoft.Word

Affected - Fixed in - Latest tracked 16.112.2 undetermined
Microsoft Office Windows winget:Microsoft.Office

Affected - Fixed in - Latest tracked - undetermined

Vulnerable CPE configurations (18)

Vendor	Product	Platform	Versions	CPE 2.3 URI
microsoft	office All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office:2019::::::x64:
microsoft	office All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office:2019::::::x64:
microsoft	office All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office:2019::::::x86:
microsoft	office All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office:2019::::::x86:
microsoft	office_long_term_servicing_channel All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:::::-:x64:*
microsoft	office_long_term_servicing_channel All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:::::-:x64:*
microsoft	office_long_term_servicing_channel All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:::::-:x86:*
microsoft	office_long_term_servicing_channel All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:::::-:x86:*
microsoft	office_long_term_servicing_channel macOS	macOS	-	cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:::::macos::
microsoft	office_long_term_servicing_channel All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:::::-:x64:*
microsoft	office_long_term_servicing_channel All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:::::-:x64:*
microsoft	office_long_term_servicing_channel All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:::::-:x86:*
microsoft	office_long_term_servicing_channel All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:::::-:x86:*
microsoft	office_long_term_servicing_channel macOS	macOS	-	cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:::::macos::
microsoft	word All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:word:2016::::::x64:
microsoft	word All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:word:2016::::::x64:
microsoft	word All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:word:2016::::::x86:
microsoft	word All platforms (wildcard)	All platforms (wildcard)	-	cpe:2.3:a:microsoft:word:2016::::::x86:

View on NVD ↗ Advisory · msrc.microsoft.com