Local privilege elevation via Secure Boot bypass
Published Jun 9, 2026 · Updated Jun 9, 2026
Improper access control in Windows Secure Boot allows local users with administrative privileges to elevate privileges locally. Microsoft has not disclosed the affected Secure Boot code path or the access-control operation that mishandles privileged local input. Exploitation requires local administrative privileges and can expose or alter protected data without interrupting system availability.
Summary
What happened
Improper access control in Windows Secure Boot allows local users with administrative privileges to elevate privileges locally. Microsoft has not disclosed the affected Secure Boot code path or the access-control operation that mishandles privileged local input. Exploitation requires local administrative privileges and can expose or alter protected data without interrupting system availability.
The record
- CVE
- CVE-2026-48578
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-284, T1542.003
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.8880
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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