CVE-2026-49783
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
Improperly implemented security check for Secure Boot in Windows allows an authorized attacker to bypass a security feature locally.
Risk Assessment
An attacker with local access can bypass Secure Boot, potentially allowing unauthorized code execution during system startup.
Recommendation
Install the latest Windows security updates from Microsoft.
Other vulnerabilities in Windows Secure Boot
See all- CVE-2026-48578High
Windows Secure Boot has an improper access control vulnerability that allows an authorized attacker to elevate privileges locally.
- CVE-2026-48576High
A vulnerability in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.
- CVE-2026-48575High
A protection mechanism failure in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.
- CVE-2026-48573High
A vulnerability in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.
- CVE-2026-48570High
A protection mechanism failure in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.
- CVE-2026-48568High
A protection mechanism failure in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.
- CVE-2026-45654High
Improper access control in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.
- CVE-2026-45588High
A protection mechanism failure in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.
- CVE-2026-21265Medium
The vulnerability involves expiring Microsoft certificates in Secure Boot. Failure to update them may cause loss of Secure Boot functionality and protection against malware. The update process can be disrupted by firmware defects.
Original NVD description (English source)
Improperly implemented security check for standard in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.