CVE-2026-59128: Windows Encrypting File System (EFS) Information Disclosure Vulnerability
Out-of-bounds 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 10.0.28000.2704Patch KB5121000 - Upgrade
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Fixed in 10.0.14393.9418Patch KB5120418 - Upgrade
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Fixed in 10.0.26100.33296Fixed in 10.0.26100.33222Patch KB5120228 - Upgrade
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Fixed in 10.0.22631.7517Patch KB5120240 - Upgrade
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Fixed in 10.0.19045.7663Patch KB5120249 - Upgrade
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Fixed in 10.0.19044.7663Patch KB5120249 - Upgrade
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Fixed in 10.0.20348.5499Fixed in 10.0.20348.5440Patch KB5120229 - Upgrade
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Fixed in 10.0.17763.9115Patch KB5120238 - Upgrade
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Fixed in 6.2.9200.26280Patch KB5120386 - Upgrade
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Fixed in 6.3.9600.23338Patch KB5120385 - Upgrade
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Fixed in 10.0.26200.9168Fixed in 10.0.26200.9106Patch KB5120994 - Upgrade
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Fixed in 10.0.26100.9168Fixed in 10.0.26100.9106Patch KB5120994 - Upgrade
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Fixed in 10.0.26100.9168Fixed in 10.0.26200.9106Patch KB5120994
Event History
Frequently Asked Questions
What is the severity of CVE-2026-59128?
CVE-2026-59128 has a medium severity score of 5.5.
What does CVE-2026-59128 affect?
CVE-2026-59128 affects Microsoft Windows 10, Windows 11, and various versions of Windows Server.
How do I fix CVE-2026-59128?
To fix CVE-2026-59128, apply the latest security update provided by Microsoft.
What is the impact of CVE-2026-59128?
CVE-2026-59128 can allow an authorized attacker to disclose local information via an out-of-bounds read.
Is CVE-2026-59128 reversible?
There is no indication in the advisory that the effects of CVE-2026-59128 are reversible.