CVE tracker / CVE-2026-21250
CVE-2026-21250
CVE-2026-21250 is the Windows HTTP.sys Elevation of Privilege Vulnerability. Microsoft rates it Important, CVSS 7.8. It is not in CISA's Known Exploited Vulnerabilities catalog. Published February 10, 2026.
Risk summary
HighElevation of Privilege
7.8
CVSS v3 base
1.1%
EPSS: chance of exploitation in 30 days
High
Severity
Important
Microsoft's rating
Unlikely
Microsoft: exploitation
No
In CISA KEV
Microsoft describes it: “Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.”
How to fix it
Microsoft lists 9 affected products and the update that fixes each:
- KB5075897 · fixed build 10.0.25398.2149
Windows Server 2022, 23H2 Edition (Server Core installation) - KB5075899 · fixed build 10.0.26100.32370
Windows Server 2025, Windows Server 2025 (Server Core installation) - KB5077179 · fixed build 10.0.28000.1575
Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems - KB5077181 · fixed build 10.0.26100.7840, 10.0.26200.7840
Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems
What Microsoft changed
- February 10, 2026: Information published.
Details
- Weakness
- CWE-822: Untrusted Pointer Dereference
- Publicly disclosed (Microsoft)
- No
- Exploited (Microsoft)
- No
- Known exploited (CISA KEV)
- Not listed
- Published
- February 10, 2026
- Last revised
- February 10, 2026
Get told when this changes
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References
From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.