CVE-2026-62775

Local information disclosure via incorrect authorization

Published Aug 11, 2026 · Updated Aug 25, 2026

Information disclosure in Windows 11 version 26H1 before 10.0.28000.2704 allows local users to read data via unionfs.sys authorization flaws. Microsoft's public records do not identify the specific code path or resource check, disclosing only that the Windows Container Isolation FS Filter Driver performs authorization incorrectly during local access to protected data. Exploitation requires local access with low privileges, and the published impact is bounded to confidentiality loss with no stated ability to modify data or interrupt the system.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Windows 11 version 26H1 before 10.0.28000.2704 allows local users to read data via unionfs.sys authorization flaws. Microsoft's public records do not identify the specific code path or resource check, disclosing only that the Windows Container Isolation FS Filter Driver performs authorization incorrectly during local access to protected data. Exploitation requires local access with low privileges, and the published impact is bounded to confidentiality loss with no stated ability to modify data or interrupt the system.

The record

CVE
CVE-2026-62775
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-863
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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