Administrator-level Secure Boot bypass
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 security. Microsoft identifies the flaw as CWE-693 but has not disclosed the affected code path, malformed input, or failed validation operation. Exploitation requires local high privileges and no user interaction, and the reported consequence is loss of confidentiality and integrity across the Secure Boot trust boundary.
Summary
What happened
Protection mechanism failure in Microsoft Windows Secure Boot allows local users with administrative privileges to bypass boot security. Microsoft identifies the flaw as CWE-693 but has not disclosed the affected code path, malformed input, or failed validation operation. Exploitation requires local high privileges and no user interaction, and the reported consequence is loss of confidentiality and integrity across the Secure Boot trust boundary.
The record
- CVE
- CVE-2026-45588
- 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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