CVE-2026-33109Network attack vector

Authenticated code execution via improper access control

Published May 7, 2026 · Updated May 7, 2026

Improper access control in Microsoft Azure Managed Instance for Apache Cassandra allows remote authenticated users to execute code. Microsoft has not published the affected interface, code path, or access-control check that incorrectly permits the operation. Exploitation requires low-privileged service access over the network; the resulting code execution can cross the vulnerable service's security boundary.

CVSS severity9.9
Critical
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Microsoft Azure Managed Instance for Apache Cassandra allows remote authenticated users to execute code. Microsoft has not published the affected interface, code path, or access-control check that incorrectly permits the operation. Exploitation requires low-privileged service access over the network; the resulting code execution can cross the vulnerable service's security boundary.

The record

CVE
CVE-2026-33109
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Microsoft
Product
Azure Managed Instance for Apache Cassandra
Classifications
CWE-284
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 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 privilegesauthenticated

What is affected?

Microsoft · Azure Managed Instance for Apache Cassandraversion=-

Published CVSS scores

9.9Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

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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