CVE-2026-21510
Windows Shell Security Feature Bypass Vulnerability
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows Shell Security Feature Bypass Vulnerability
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
- Record
CVE-2026-21510- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C - Weakness
- CWE-693
- Updated
- 2026-11-02
EUVDEUVD-2026-7337
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
- Record
EUVD-2026-7337- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-q6v4-4w5r-j7hr
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a...
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
- Record
GHSA-q6v4-4w5r-j7hr- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-693
- Updated
- 2026-11-02
CISA KEV No score
Microsoft Windows Shell Protection Mechanism Failure Vulnerability
Microsoft Windows Shell contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.
- Record
CVE-2026-21510- Weakness
- CWE-693
- Updated
- 2026-11-02
NVD
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
- Record
CVE-2026-21510- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-693
- Updated
- 2026-11-02
Affected products
- microsoft windows
- microsoft windows 10 version 1607
- microsoft windows 10 version 1809
- microsoft windows 10 version 21h2
- microsoft windows 10 version 22h2
- microsoft windows 11 version 22h3
- microsoft windows 11 version 23h2
- microsoft windows 11 version 24h2
- microsoft windows 11 version 25h2
- microsoft windows 11 version 26h1
- microsoft windows server 2012
- microsoft windows server 2012 (server core installation)
Show 18 moreShow less
- microsoft windows server 2012 r2
- microsoft windows server 2012 r2 (server core installation)
- microsoft windows server 2016
- microsoft windows server 2016 (server core installation)
- microsoft windows server 2019
- microsoft windows server 2019 (server core installation)
- microsoft windows server 2022
- microsoft windows server 2022, 23h2 edition (server core installation)
- microsoft windows server 2025
- microsoft windows server 2025 (server core installation)
- microsoft windows 10 1607
- microsoft windows 10 1809
- microsoft windows 10 21h2
- microsoft windows 10 22h2
- microsoft windows 11 23h2
- microsoft windows 11 24h2
- microsoft windows 11 25h2
- microsoft windows server 2022 23h2
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | andreassudo/CVE-2026-21510-CVSS-8.8-Important-Windows-Shell-security-feature-bypass | 2026-02-11 |
| PoC in GitHub | EpSiLoNPoInTOrI/EpSiLoNPoInTlnk | 2026-05-09 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation, exploits | ||
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-21510 is a high vulnerability (CVSS 8.8) in Microsoft Windows, published February 10, 2026. CISA lists it as known to be exploited, since February 10, 2026. EUVD reports exploitation since February 10, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 61.2%, the 99th percentile. No source names a fixed version.