Quick answers
- Is CVE-2026-45588 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-45588 being exploited in the wild.
- How severe is CVE-2026-45588?
- High severity, with a CVSS score of 7.9, published 9 June 2026.
- Which products and versions are affected?
- Microsoft Windows Secure Boot.
- Is there a fix for CVE-2026-45588?
- A patch was published on 2026-06-09: Security update released by Microsoft Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-45588 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-45588?
- Check whether you run Microsoft Windows Secure Boot. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A protection mechanism failure (CWE-693) exists in the Windows Secure Boot implementation. The vulnerability allows a local attacker with high privileges (Administrator) to bypass Secure Boot integrity checks without user interaction. By successfully exploiting this flaw, an attacker can compromise the boot chain and potentially gain persistent control over the system firmware or kernel environment. The vulnerability is tracked as CVE-2026-45588 and has a CVSS 3.1 base score of 7.9, reflecting the impact on confidentiality and integrity across security scopes. Microsoft has released security updates to address this issue.
Affected products
- Microsoft Windows Secure Boot
Timeline
- 2026-06-09: advisory: Initial disclosure by Microsoft and NVD
- 2026-06-09: patched: Security update released by Microsoft