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CVE-2026-0390 is a security feature bypass vulnerability in Windows Boot Loader, described as a UEFI Secure Boot issue caused by reliance on untrusted inputs in a security decision. An authorized local attacker can exploit this flaw to subvert a boot-time security control. Available reporting indicates the weakness affects an authentication-related protection path in the boot process and can enable impersonation by causing the boot loader to make a trust decision based on attacker-controlled or insufficiently trusted input.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows Boot Loader security feature bypass vulnerability affecting the Secure Boot chain of trust.
A UEFI Secure Boot security feature bypass vulnerability.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.