Azure Virtual Machines: Security feature bypass in Secure Boot
Summary
A flaw in the Azure firmware of Microsoft Azure Virtual Machines allows a bypass of the Secure Boot protection. Certificate revocation is not checked properly, which affects Trusted Launch and confidential VMs. An attacker needs local access with high privileges and no user interaction, and the impact is limited to integrity. No exploitation or public proof of concept is known, and Microsoft has released a platform update.
Affected
- Microsoft Azure Virtual Machines before version 2610 (per CNA record)
- Relevant mainly for Trusted Launch and confidential VMs (Secure Boot feature)
- Version identifier not verified against the MSRC affected-products table: Unknown.
Fixed in
- Version 2610 (per third-party tracker OffSeq; verify on the MSRC page)
- Microsoft deploys a platform update; affected VMs must be restarted to apply the updated Secure Boot protection.
Workaround
- None documented. Microsoft recommends applying the platform update and restarting affected VMs.
Exploitation
- No evidence of exploitation in the wild (Rapid7, SANS ISC).
- CISA SSVC: exploitation none, not automatable.
- No public proof of concept found.
Our recommendation
- Check whether any Azure VMs use Trusted Launch or confidential VM features.
- If yes, confirm the Microsoft platform update has been applied and restart the affected VMs.
- If no such VMs exist, the vulnerability is likely not relevant; monitor the MSRC page for updates.
- Priority: low to medium.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- MSRC Security Update Guide: CVE-2026-109462 msrc.microsoft.com
- CVE Record CVE-2026-109462 www.cve.org
- OffSeq Radar: CVE-2026-109462 radar.offseq.com
- Rapid7: Patch Tuesday November 2026 www.rapid7.com
- SANS ISC diary 33498 isc.sans.edu
- OpenCVE: CVE-2026-109462 app.opencve.io
- Strix: CVE-2026-109462 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 21:14.
Original description (NVD)
Improper check for certificate revocation in Azure Firmware allows an authorized attacker to bypass a security feature locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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