CVE-2026-33844: Azure Managed Instance for Apache Cassandra Remote Code Execution Vulnerability

Overview

Severity

Critical (CVSS 9)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Patch Tuesday

2026-May

Released

2026-05-07

EPSS Score

0.05% (percentile: 15.3%)

Description

Improper input validation in Azure Managed Instance for Apache Cassandra allows an authorized attacker to execute code over a network.

FAQ

Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability? This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency. Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.

Affected Products (1)

Azure

• Azure Managed Instance for Apache Cassandra

Acknowledgments

<a href="https://twitter.com/wtm_offensi">wtm</a> with <a href="https://offensi.com/">Offensi</a>

Revision History

• 2026-05-07: Information published.