HomeMicrosoftCVE-2026-21509

CVE-2026-21509

HIGH
7.8CVSS
Published: 2026-01-26
Updated: 2026-01-27
AI Analysis

Description

Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.

CVSS Metrics

Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
local
Complexity
low
Privileges
none
User Action
required
Scope
unchanged
Confidentiality
high
Integrity
high
Availability
high
Weaknesses
CWE-807

Metadata

Primary Vendor
MICROSOFT
Published
1/26/2026
Last Modified
1/27/2026
Source
NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

microsoft : 365_appsmicrosoft : 365_appsmicrosoft : officemicrosoft : officemicrosoft : officemicrosoft : officemicrosoft : office_long_term_servicing_channelmicrosoft : office_long_term_servicing_channelmicrosoft : office_long_term_servicing_channelmicrosoft : office_long_term_servicing_channel

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