CVE-2026-21510
Last modified
CVE-2026-21510 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.. CISA has confirmed active exploitation in the wild. EPSS estimates a 25.84% chance of exploitation in the next 30 days.
Description
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitation Status
This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 1607 | < 10.0.14393.8868 |
| Microsoft | Windows 10 1809 | < 10.0.17763.8389 |
| Microsoft | Windows 10 21h2 | < 10.0.19044.6937 |
| Microsoft | Windows 10 22h2 | < 10.0.19045.6937 |
| Microsoft | Windows 11 23h2 | < 10.0.22631.6649 |
| Microsoft | Windows 11 24h2 | < 10.0.26100.7781 |
| Microsoft | Windows 11 25h2 | < 10.0.26200.7781 |
| Microsoft | Windows Server 2012 | All versions |
| Microsoft | Windows Server 2012 | r2 |
| Microsoft | Windows Server 2016 | < 10.0.14393.8868 |
| Microsoft | Windows Server 2019 | < 10.0.17763.8389 |
| Microsoft | Windows Server 2022 | < 10.0.20348.4711 |
| Microsoft | Windows Server 2022 23h2 | < 10.0.25398.2149 |
| Microsoft | Windows Server 2025 | < 10.0.26100.32313 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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