Elevation of Privilege in Windows VBS Enclave
CVE-2026-20876 is a heap-based buffer overflow vulnerability in Windows Virtualization-Based Security (VBS) Enclave. Microsoft describes it as an elevation-of-privilege flaw that can be exploited locally by an authorized attacker. The available reporting indicates the bug affects the VBS Enclave trust boundary and may allow the attacker to obtain Virtual Trust Level 2 (VTL2) privileges, undermining the isolation guarantees provided by virtualization-based security. No vulnerable function or code path is identified in the provided material.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Local elevation of privilege in Windows VBS enclaves; likely used as part of a post-compromise chain per the content.
A Windows VBS Enclave elevation-of-privilege vulnerability (heap overflow) that can allow a high-privileged local attacker to escalate into VTL2, undermining virtualization-based isolation protections.
A Windows VBS Enclave elevation-of-privilege vulnerability (heap overflow) that can allow a high-privileged local attacker to escalate into VTL2, undermining virtualization-based isolation protections.
An elevation-of-privilege vulnerability impacting Windows Virtualization-Based Security (VBS) enclaves.
The version that knows your environment.
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.