CVE-2026-0421 Security feature bypass in ThinkPad L13 Gen 6 2 in 1 BIOS
Attackers can bypass Secure Boot protection on specific Lenovo ThinkPad models when configured in User Mode, potentially allowing unauthorized code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-0421?
CVE-2026-0421 is a high-severity vulnerability in Lenovo ThinkPad L13 Gen 6 2 in 1 BIOS, published on 14 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A potential vulnerability was reported in the BIOS of L13 Gen 6, L13 Gen 6 2-in-1, L14 Gen 6, and L16 Gen 2 ThinkPads which could result in Secure Boot being disabled even when configured as “On” in the BIOS setup menu. This issue only affects systems where Secure Boot is set to User Mode.
Weakness: CWE-252
Which versions are affected by CVE-2026-0421?
How do I fix CVE-2026-0421?
No fix has been published for CVE-2026-0421 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-0421 being exploited?
There is no known exploitation of CVE-2026-0421 in the wild and no public exploit code.
Sources
Also known as GHSA-5m9v-m547-62qf.