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CVE-2026-62741

Windows HTTP.sys Elevation of Privilege Vulnerability

Published: Aug 11, 2026Updated: Aug 16, 2026 Sources: CVE List NVDCWE-122
7.8HIGH
NVD MITRE
EPSS Score
2.0%
Top 21.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Integer underflow (wrap or wraparound) in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

In plain language

AI Act now

CVE-2026-62741 is a Windows privilege-escalation flaw that lets a low-privileged local user gain high privileges on the same PC; most small businesses should patch because it applies to common Windows versions and only requires local access.

Executive summary

CVE-2026-62741 is a local privilege-escalation issue in Windows HTTP.sys caused by an integer underflow/wraparound in the HTTP service; a low-privileged authenticated user can trigger it to escalate to full control on the same machine.

If affected, business impact
Full control by a local userAccount takeover on the deviceWorm-like spread via compromised accountsService and data disruption

What to do now

  1. Check whether the affected Windows version is installed and whether your system has pending updates for Windows HTTP components.
  2. Compare your current Windows build/patch level against the fixed versions listed by Microsoft for CVE-2026-62741.
  3. Install the Microsoft fix for CVE-2026-62741 (or the latest cumulative update that includes it) on every affected machine.
  4. If you can’t patch immediately, restrict who has local logon/low-privileged access on the device until updates are applied, and monitor for unusual privilege changes after local logons.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-122CWE-191

Affected Products

Microsoft
commercial·US
Windows 10 Version 1607On-premOS
Operating Systems / windows
Windows 11 version 23H2On-premOS
Operating Systems / windows
Windows Server 2012 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2016 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022On-premOS
Operating Systems / windows
Windows Server 2025 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 R2 (Server Core installation)On-premOS
Operating Systems / windows
and 25 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-62741?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62741
msrc.microsoft.com
News mentions
4

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