MicrosoftRadarIndependent status for Microsoft services

Microsoft Outlook Spoofing Vulnerability

CVE-2026-21260 is a spoofing vulnerability in Microsoft Office Outlook (rated Important, CVSS 7.5).

1 version

Facts

Microsoft id
CVE-2026-21260
Products
Microsoft Office Outlook
Severity
Important
Impact
Spoofing
CVSS
7.5
CVSS vector
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
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Unlikely
Customer action required
Yes
Release
2026-Feb
Assigned by
Microsoft
Weakness
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
MSRC revision
1.0
Status pages
Outlook status
First captured by us
(from our first import of this list)
Microsoft last modified
Source
Security updates · open the original at Microsoft

Microsoft's revision notes

  1. Revision 1.0, 2026-02-10: Information published.

Microsoft says

Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Security updates,

Read Microsoft's full post

What Microsoft changed

One version so far. If Microsoft edits it, each change shows here with what was removed and added.

  1. First version we captured ·

    The text as we first saw it

    Seen by us · Microsoft's timestamp · Microsoft's page

Other changes for Outlook