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Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-21511

CVE-2026-21511

HIGH7.5

Microsoft Outlook Spoofing Vulnerability

Published Feb 10, 2026

Modified 5 days ago

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21511

https://www.cve.org/CVERecord?id=CVE-2026-21511

CVSS Analysis

CVSS v3.1

7.5

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

NoneI:N

Availability

NoneA:N

7.5/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Weakness Type (CWE)

Serialization

Deserialization of Untrusted Data

Ecosystems

Timeline

PublishedFeb 10, 2026

ModifiedFeb 27, 2026

CVE-2026-21511 | Mondoo Vulnerability Intelligence