CVE-2026-62766

Authenticated privilege escalation via Kerberos double free

Published Aug 11, 2026 · Updated Aug 25, 2026

Double free in Windows Kerberos in Microsoft Windows 11 and Windows Server 2025 allows local authenticated users to gain elevated privileges. Microsoft has disclosed only the bug class in the Windows Kerberos component: the component frees the same memory more than once, corrupting allocator state. Local code execution with existing privileges is the known gate, and public records do not identify the exact routine or any effect beyond privilege escalation on the affected host.

CVSS severity7.0
High
EPSS probability1.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in Windows Kerberos in Microsoft Windows 11 and Windows Server 2025 allows local authenticated users to gain elevated privileges. Microsoft has disclosed only the bug class in the Windows Kerberos component: the component frees the same memory more than once, corrupting allocator state. Local code execution with existing privileges is the known gate, and public records do not identify the exact routine or any effect beyond privilege escalation on the affected host.

The record

CVE
CVE-2026-62766
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.0Microsoft CorporationCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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