CVE-2026-69836Network attack vector

Unauthenticated code execution via unsafe deserialization

Published Aug 20, 2026 · Updated Aug 25, 2026

Deserialization of untrusted data in Microsoft Entra ID allows remote attackers to execute code over a network without authentication. Microsoft has not disclosed the affected service component, serialized input format, deserialization API, or network endpoint. The flaw is confined to Microsoft's hosted service, and successful exploitation grants code execution in that service without a tenant account or user interaction.

CVSS severity10.0
Critical
EPSS probability1.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Microsoft Entra ID allows remote attackers to execute code over a network without authentication. Microsoft has not disclosed the affected service component, serialized input format, deserialization API, or network endpoint. The flaw is confined to Microsoft's hosted service, and successful exploitation grants code execution in that service without a tenant account or user interaction.

The record

CVE
CVE-2026-69836
Published
Aug 20, 2026
Updated
Aug 25, 2026
Vendor
Microsoft
Product
Microsoft Entra
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Entraversion=-

Published CVSS scores

10.0MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

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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