VDB

CVE-2026-21250

CVE-2026-21250 PUBLISHED CVSS 7.8 HIGH

Windows HTTP.sys Elevation of Privilege Vulnerability

Reported by microsoft · Published February 10, 2026

Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

Risk scores

CVSS 3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Affected products

VendorProductVersions
MicrosoftWindows 11 Version 24H210.0.26100.0
MicrosoftWindows 11 Version 25H210.0.26200.0
MicrosoftWindows 11 version 26H110.0.28000.0
MicrosoftWindows 11 Version 26H110.0.28000.0
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0
MicrosoftWindows Server 202510.0.26100.0
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0
MicrosoftWindows 11 Version 24H210.0.26100.0
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0
microsoftwindows_server_202510.0.26100.0
microsoftwindows_11_25H210.0.26200.0
MicrosoftWindows 11 Version 26H110.0.28000.0
MicrosoftWindows 11 Version 25H210.0.26200.0
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0
microsoftwindows_11_24H210.0.26100.0
MicrosoftWindows 11 version 26H110.0.28000.0
microsoftwindows_11_26H110.0.28000.0
microsoftwindows_server_23h210.0.25398.0
MicrosoftWindows Server 202510.0.26100.0

Timeline

  • Feb 10, 2026 CVE Published
  • Feb 10, 2026 PoC Published (139 in total, the first dated here)
  • Feb 11, 2026 EPSS Score (30 in total, the first dated here)
  • Mar 17, 2026 Security Advisory (6 in total, the first dated here)
  • Mar 25, 2026 Coalition ESS Score (2 in total, the first dated here)
  • Aug 19, 2026 CVE Updated

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln CVE-2026-21250
vulnetix vdb fixes CVE-2026-21250

Or with curl, using the org id and key from your account page:

curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-21250/fixes/registry"

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References

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