CVE-2026-50652Network attack vector

Unauthenticated service interruption

Published Jul 14, 2026 · Updated Jul 14, 2026

Deserialization of untrusted data in Microsoft Entra ID 2021 before 5.7.1 allows remote attackers to interrupt the service. Microsoft has not disclosed the affected deserialization component, serialized input format, or operation that exhausts or terminates service resources. No authentication or user interaction is required; the documented consequence is availability loss, with no reported data access or modification.

CVSS severity7.5
High
EPSS probability1.73%
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 2021 before 5.7.1 allows remote attackers to interrupt the service. Microsoft has not disclosed the affected deserialization component, serialized input format, or operation that exhausts or terminates service resources. No authentication or user interaction is required; the documented consequence is availability loss, with no reported data access or modification.

The record

CVE
CVE-2026-50652
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Microsoft
Product
Microsoft Entra ID
Classifications
CWE-502, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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=2021 <5.7.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Entra IDversion=2021 <5.7.1

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499Endpoint Denial of Service

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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