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Vulnerabilities

Vulnerability · CVE-2026-102202

Improper access control in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

Published Oct 13, 2026 · catalog updated Oct 20, 2026 · windows 11 23h2

Open the advisory

Exploitation likelihood is not on this record for CVE-2026-102202. A missing EPSS score is not a low risk. Compare windows 11 23h2 with the linked advisory before you change production.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Version ranges on file
Affected products
cpe microsoft/windows 11 23h2 · cpe microsoft/windows 11 24h2 · cpe microsoft/windows 11 25h2 · cpe microsoft/windows 11 26h1

Improper access control in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows 11 23h2< 10.0.22631.7652
  • cpe microsoft/windows 11 24h2< 10.0.26100.9711
  • cpe microsoft/windows 11 25h2< 10.0.26200.9711
  • cpe microsoft/windows 11 26h1< 10.0.28000.3231

How to fix CVE-2026-102202

  • Recommended remediation

    Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for CVE-2026-102202. A missing EPSS score is not a low risk. Compare windows 11 23h2 with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with microsoft/windows 11 23h2 < 10.0.22631.7652; microsoft/windows 11 24h2 < 10.0.26100.9711; microsoft/windows 11 25h2 < 10.0.26200.9711; microsoft/windows 11 26h1 < 10.0.28000.3231. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-59: Link Following. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · NIST NVD

    Detected

    Improper access control in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

  2. Oct 20, 2026 · NIST NVD

    Updated

    Improper access control in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

Sources

  • NIST NVDVulnerability recordCVE-2026-102202

    Improper access control in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 20, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.