CVE-2026-83565: Windows Encrypting File System (EFS) Information Disclosure Vulnerability
Buffer over-read in Windows Encrypting File System (EFS) allows an authorized attacker to disclose information locally.
Other sources
Windows Encrypting File System (EFS) Information Disclosure 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 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
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Fixed in 10.0.26100.33650Patch KB5126646 - 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 10.0.22631.7652Patch KB5126653 - Upgrade
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Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
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Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651
Event History
Frequently Asked Questions
Who is exposed to this vulnerability?
Systems running the listed Microsoft Windows versions or Windows Server versions with Windows Encrypting File System (EFS) are in scope. Exploitation is local rather than network-based.
What level of access does an attacker need?
An attacker must already be authorized on the affected system and have local access. No user interaction is required.
What is the impact if exploitation succeeds?
The vulnerability may allow disclosure of information. The provided severity data indicates high confidentiality impact, with no stated integrity or availability impact.