Secure Boot Security Feature Bypass Vulnerability (CVE-2026-41097)
Published Sources: CVE.org, EUVD, Msrc Update Guide, BSI
What is affected, what to do
Reliance on a component that is not updateable in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.
Update Microsoft Windows 10 Version 1809 to version 10.0.17763.8755, Microsoft Windows 10 Version 21H2 to version 10.0.19044.7291, Microsoft Windows 10 Version 22H2 to version 10.0.19045.7417.
- Affected
- Microsoft Windows 10 Version 1809
lt 10.0.17763.0..10.0.17763.8755 - Microsoft Windows 10 Version 21H2
lt 10.0.19044.0..10.0.19044.7291 - Microsoft Windows 10 Version 22H2
lt 10.0.19045.0..10.0.19045.7417 - Microsoft Windows 11 version 23H2
lt 10.0.22631.0..10.0.22631.7079 - Microsoft Windows 11 Version 23H2
lt 10.0.22631.0..10.0.22631.7219 - Microsoft Windows 11 Version 24H2
lt 10.0.26100.0..10.0.26100.8457 - Microsoft Windows 11 Version 25H2
lt 10.0.26200.0..10.0.26200.8457 - Microsoft Windows 11 version 26H1
lt 10.0.28000.0..10.0.28000.2113 - Microsoft Windows Server 2019
lt 10.0.17763.0..10.0.17763.8755 - Microsoft Windows Server 2019 (Server Core installation)
lt 10.0.17763.0..10.0.17763.8755 - Microsoft Windows Server 2022
lt 10.0.20348.0..10.0.20348.5139 - Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
lt 10.0.25398.0..10.0.25398.2330 - Microsoft Windows Server 2025
lt 10.0.26100.0..10.0.26100.32860 - Microsoft Windows Server 2025 (Server Core installation)
lt 10.0.26100.0..10.0.26100.32860
- Microsoft Windows 10 Version 1809
- Fixed in
- Microsoft Windows 10 Version 1809
10.0.17763.8755 - Microsoft Windows 10 Version 21H2
10.0.19044.7291 - Microsoft Windows 10 Version 22H2
10.0.19045.7417 - Microsoft Windows 11 version 23H2
10.0.22631.7079 - Microsoft Windows 11 Version 23H2
10.0.22631.7219 - Microsoft Windows 11 Version 24H2
10.0.26100.8457 - Microsoft Windows 11 Version 25H2
10.0.26200.8457 - Microsoft Windows 11 version 26H1
10.0.28000.2113 - Microsoft Windows Server 2019
10.0.17763.8755 - Microsoft Windows Server 2019 (Server Core installation)
10.0.17763.8755 - Microsoft Windows Server 2022
10.0.20348.5139 - Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.2330 - Microsoft Windows Server 2025
10.0.26100.32860 - Microsoft Windows Server 2025 (Server Core installation)
10.0.26100.32860
- Microsoft Windows 10 Version 1809
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Metrics
6.7
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
6.7
CVSS v3
Severity Medium on the scale from 0 to 10.
Source: CVE.org, EUVD, Msrc Update Guide, BSI
2.2 %
EPSS score
Moderate — model estimates 1-10% exploitation likelihood.
Source: FIRST EPSS, percentile 82.6
Show all metrics
- Severity
- Medium
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 105.72 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 6.7 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 6.7
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 2.2 %
- Moderate — model estimates 1-10% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 82.6
- Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
CWE
CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.
Read in glossary- CWE-1329
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
Reliance on a component that is not updateable in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.
Source: NVD (NIST), CVE.org (MITRE), ENISA EUVD, Microsoft Security Update Guide, cvelistv5, BSI CSAF, BSI WID Portal
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Microsoft | Windows 10 Version 1809 |
|
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| Microsoft | Windows 10 Version 21H2 |
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| Microsoft | Windows 10 Version 22H2 |
|
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| Microsoft | Windows 11 version 23H2 |
|
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| Microsoft | Windows 11 Version 23H2 |
|
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| Microsoft | Windows 11 Version 24H2 |
|
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| Microsoft | Windows 11 Version 25H2 |
|
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| Microsoft | Windows 11 version 26H1 |
|
|
| Microsoft | Windows Server 2019 |
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| Microsoft | Windows Server 2019 (Server Core installation) |
|
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| Microsoft | Windows Server 2022 |
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| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) |
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| Microsoft | Windows Server 2025 |
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| Microsoft | Windows Server 2025 (Server Core installation) |
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Vendors and products
- Microsoft Microsoft Windows 10 1809
- Microsoft Microsoft Windows 10 21H2
- Microsoft Microsoft Windows 10 22h2
- Microsoft Windows 10 Version 1809
- Microsoft Windows 10 Version 21h2
- Microsoft Windows 10 Version 22h2
- Microsoft Microsoft Windows 11 23H2
- Microsoft Microsoft Windows 11 24H2
- Microsoft Microsoft Windows 11 25H2
- Microsoft Microsoft Windows 11 26H1
- Microsoft Windows 11 Version 23h2
- Microsoft Windows 11 Version 24h2
Affected operating systems
| Family | Vendor | Product | Version |
|---|---|---|---|
| Windows | microsoft | windows_10_1809 | — |
| Windows | microsoft | windows_10_21h2 | — |
| Windows | microsoft | windows_10_22h2 | — |
| Windows | microsoft | windows_11_23h2 | — |
| Windows | microsoft | windows_11_24h2 | — |
| Windows | microsoft | windows_11_25h2 | — |
| Windows | microsoft | windows_11_26h1 | — |
| Windows | microsoft | windows_server_2019 | — |
| Windows | microsoft | windows_server_2022 | — |
| Windows | microsoft | windows_server_2022_23h2 | — |
| Windows | microsoft | windows_server_2025 | — |
Weakness classes (CWE)
CWE-1329Reliance on Component That is Not Updateable
Base
The product contains a component that cannot be updated or patched in order to remove vulnerabilities or significant bugs.
Entry at MITRE CWE-1329
References & sources
- Microsoft Security Update GuideSecure Boot Security Feature Bypass VulnerabilityVendor advisory, Patch, Vendor advisory
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<a href="https://intel.neosec.eu/en/cve/CVE-2026-41097"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-41097.svg?lang=en" alt="CVE-2026-41097 – NEOSEC Intel" height="20"></a>