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CVE-2026-27913 is an Important security feature bypass vulnerability in Windows BitLocker caused by improper input validation. The flaw allows an unauthorized attacker with local access to bypass a core platform protection enforced during system startup. Available reporting indicates the most significant consequence is bypass of Secure Boot, undermining the trusted boot chain that is intended to ensure only trusted and properly signed software executes during boot. Microsoft assessed exploitation as more likely, and the issue affects multiple supported Windows Server releases, including both full desktop and Server Core deployments.
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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.
If you can’t patch tonight, do this now.
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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows BitLocker security feature bypass vulnerability caused by improper input validation that allows a local unauthorized attacker to bypass Secure Boot and undermine device confidentiality and integrity.
A Windows BitLocker security feature bypass vulnerability caused by improper input validation.
A Windows BitLocker 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.