CVE-2026-84011: Windows SMB Client Security Feature Bypass Vulnerability
Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security feature locally.
Other sources
Windows SMB Client Security Feature Bypass Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648
Event History
Frequently Asked Questions
Does exploitation require remote network access?
No. The attack vector is local, so the attacker must be able to act on the affected Windows system locally.
What level of access does an attacker need before exploiting this issue?
The attacker must already be authorized on the system. The vulnerability is rated with low privileges required and does not require user interaction.
What is the indicated security impact?
The supplied severity vector indicates an integrity impact, with no indicated confidentiality or availability impact. The scope is unchanged.
Which listed Windows platforms should be reviewed?
The affected software list includes Microsoft Windows 11, Microsoft Windows Server 2025, and Microsoft Windows Server 2022.