CVE-2026-8863 CVE-2026-8863
Attackers with admin privileges can bypass Secure Boot using vulnerable SHIM bootloaders to execute arbitrary code before OS load.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8863?
CVE-2026-8863 is a high-severity vulnerability in Blancco UK Abitti 1, published on 9 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Multiple Microsoft-sigend UEFI SHIM bootloaders are vulnerable to SecureBoot bypass. An attacker with administrative privileges or the ability to modify the boot process could use one of the vulnerable shim bootloaders to bypass Secure Boot protections and execute arbitrary code before the operating system loads. Specific UEFI DBX update is required to block these vulnerable boot loaders.
Which versions are affected by CVE-2026-8863?
How do I fix CVE-2026-8863?
No fix has been published for CVE-2026-8863 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-8863 being exploited?
There is no known exploitation of CVE-2026-8863 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-4hqv-6cp5-4rq9.