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CVE-2026-62732

Windows Telephony Service Elevation of Privilege Vulnerability

Published: Aug 11, 2026Updated: Aug 18, 2026 Sources: CVE List NVDCWE-122
7.8HIGH
NVD MITRE
EPSS Score
0.3%
Top 76.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Heap-based buffer overflow in Windows Telephony Service allows an authorized attacker to elevate privileges locally.

In plain language

AI Act now

This is a Windows local security hole in the Telephony Service that lets a low-privileged attacker take full control of the computer—if you have that service on and someone can already run low-level code on your machine, you should act quickly.

Executive summary

CVE-2026-62732 is a Windows Telephony Service memory flaw (CWE-122) that enables local elevation of privilege by allowing a low-privileged attacker to trigger a bug without needing user interaction; affected systems include Windows versions where the Telephony Service is installed.

If affected, business impact
Full takeover of affected Windows hostPossible ransomware deploymentLoss of control over business systemsSensitive data access via admin control

What to do now

  1. Check whether your Windows machine has the Telephony Service installed/enabled (Telephony/phone-related service components are present).
  2. Identify your exact Windows version and build number.
  3. Update using Microsoft’s fix for CVE-2026-62732 (install the security update from the MSRC update guide linked below) so you reach the fixed build for your version:
    • Windows 10: 10.0.14393.9418 OR 10.0.17763.9121 OR 10.0.19044.7663 OR 10.0.19045.7663
    • Windows 11: 10.0.22631.7517 OR 10.0.26100.9168 OR 10.0.26200.9168 OR 10.0.28000.2704
    • Windows Server 2012: 6.2.9200.26280
    • Windows Server 2012 R2: 6.3.9600.23338
    • Windows Server 2016: 10.0.14393.9418
    • Windows Server 2019: 10.0.17763.9121
  4. If you cannot patch immediately, remove/disable the Telephony Service (or the phone/telephony component) on machines that do not require it, and restrict local low-privilege access as much as possible until updates are applied.
  5. After patching, verify the Windows update status and re-check that your build matches one of the fixed versions above.
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-122

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 2012 R2 (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
and 25 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-62732?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

1 technique
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62732
msrc.microsoft.com
News mentions
2

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