Administrative bypass of Secure Boot trust enforcement
Published Jun 9, 2026 · Updated Jun 9, 2026
Protection mechanism failure in Microsoft Windows Secure Boot allows local users with administrative privileges to bypass boot trust controls. Microsoft has not disclosed which Secure Boot component fails or what operation mishandles attacker-controlled boot material. Administrative access is required; successful exploitation crosses a security boundary and compromises confidentiality and integrity without reported service interruption.
Summary
What happened
Protection mechanism failure in Microsoft Windows Secure Boot allows local users with administrative privileges to bypass boot trust controls. Microsoft has not disclosed which Secure Boot component fails or what operation mishandles attacker-controlled boot material. Administrative access is required; successful exploitation crosses a security boundary and compromises confidentiality and integrity without reported service interruption.
The record
- CVE
- CVE-2026-48575
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-693, 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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