CVE-2026-33109: Critical RCE in Azure Managed Instance for Apache Cassandra
The National Vulnerability Database has disclosed CVE-2026-33109, a critical improper access control vulnerability impacting Azure Managed Instance for Apache Cassandra. This flaw, rated 9.9 CVSS, allows an authenticated attacker to execute arbitrary code remotely over the network.
This isn’t just a bug; it’s a direct path to compromise. An attacker with legitimate, albeit low-privileged, access could leverage this to gain full control of the underlying Cassandra environment. Given the critical nature of Apache Cassandra in many enterprise architectures, this vulnerability presents a significant risk for data integrity, availability, and confidentiality.
Organizations leveraging Azure Managed Instance for Apache Cassandra need to prioritize understanding their exposure and immediately implement any vendor-recommended mitigations or patches. The attacker’s calculus here is simple: find an authenticated user, exploit, and pivot. Defenders must break this chain.
What This Means For You
- If your organization utilizes Azure Managed Instance for Apache Cassandra, you need to identify all instances and monitor for Microsoft's official patch or mitigation guidance for CVE-2026-33109. An authenticated attacker can achieve remote code execution, making this a top-tier threat for data compromise and service disruption.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-33109: Azure Managed Instance for Apache Cassandra RCE via Improper Access Control
title: CVE-2026-33109: Azure Managed Instance for Apache Cassandra RCE via Improper Access Control
id: scw-2026-05-07-ai-1
status: experimental
level: critical
description: |
This rule detects potential exploitation of CVE-2026-33109 by looking for specific API endpoints and query parameters commonly associated with RCE attempts in Azure Managed Instance for Apache Cassandra. The vulnerability stems from improper access control, allowing unauthorized code execution.
author: SCW Feed Engine (AI-generated)
date: 2026-05-07
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-33109/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/api/v1/data'
cs-method:
- 'POST'
cs-uri-query|contains:
- 'execute'
sc-status:
- '200'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-33109 | RCE | Azure Managed Instance for Apache Cassandra |
| CVE-2026-33109 | Auth Bypass | Improper access control |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 08, 2026 at 01:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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