CVE-2026-56155 | BDVDB-2026-348365 Detail

MicrosoftWindows 10 Version 1607

Description#

Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: local.

Weaknesses#

CWE-1220 Insufficient Granularity of Access Control

References#

Exploit#

No public exploit known

History#

Version 12026-07-14Record published in the CVE List.
Version 22026-11-01Most recent update recorded in the CVE List.

Published

Published: 2026-07-14
Last modified: 2026-11-01

Vendor information

Vendor: Microsoft
Product: Windows 10 Version 1607

All Microsoft vulnerabilities

Score

7.8 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 28.4.

KEV

Yes

Listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Affected Systems

Vulnerable
>= 10.0.14393.0 and < 10.0.14393.9339
Fixed
10.0.14393.9339

Scoring System

CVSS v4.0

Not available

CVSS v3.1

7.8 High

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

Metric breakdown
Attack Vector	Local
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).