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CVE-2026-33109 Azure Managed Instance for Apache Cassandra Remote Code Execution Vulnerability

CVE-2026-33109 is a remote code execution vulnerability in Microsoft's Azure Managed Instance for Apache Cassandra due to improper access control, allowing an authorized attacker to execute code over a network.

CVE-2026-33109 is a critical remote code execution vulnerability affecting Microsoft’s Azure Managed Instance for Apache Cassandra. The vulnerability exists due to improper access control, which allows an authorized attacker with network access to execute arbitrary code within the Cassandra instance. Successful exploitation of this vulnerability could lead to complete compromise of the Cassandra instance, potentially allowing the attacker to access sensitive data, disrupt service availability, or pivot to other resources within the Azure environment. Given the nature of managed Cassandra instances often storing critical application data, this vulnerability poses a significant risk to organizations utilizing this service.

Attack Chain

  1. Attacker gains authorized network access to the Azure Managed Instance for Apache Cassandra.
  2. Attacker identifies the endpoint or function lacking proper access controls.
  3. Attacker crafts a malicious request to the vulnerable endpoint.
  4. The request bypasses the intended access control mechanisms due to the vulnerability.
  5. The compromised endpoint executes arbitrary code provided within the malicious request.
  6. Attacker uses the executed code to establish a reverse shell or gain further access to the Cassandra instance.
  7. Attacker leverages elevated privileges to access sensitive data or modify system configurations.
  8. Attacker achieves full control over the Azure Managed Instance for Apache Cassandra.

Impact

Successful exploitation of CVE-2026-33109 allows an attacker to execute arbitrary code on the affected Azure Managed Instance for Apache Cassandra. This could result in data breaches, service disruption, or the use of the compromised instance as a staging point for further attacks within the Azure environment. Due to the nature of database services, the confidentiality, integrity, and availability of stored data are at risk. There is currently no information about the number of victims.

Recommendation

  • Apply the security update released by Microsoft to patch CVE-2026-33109 on all affected Azure Managed Instance for Apache Cassandra deployments.
  • Deploy the Sigma rule to your SIEM to monitor for potential exploitation attempts targeting CVE-2026-33109.
  • Review access control configurations for Azure Managed Instance for Apache Cassandra to ensure least privilege principles are enforced.

Detection coverage 2

Detects CVE-2026-33109 Exploitation Attempt — Suspicious Network Activity to Cassandra Instance

high

Detects CVE-2026-33109 exploitation attempt — Monitors for suspicious network connections to the Cassandra instance indicative of unauthorized access or code execution.

sigma tactics: execution techniques: T1210 sources: network_connection, azure

Detects CVE-2026-33109 Exploitation Attempt — Unusual Process Execution in Azure Cassandra

critical

Detects CVE-2026-33109 exploitation attempt — Monitors for unusual process execution within the Azure Cassandra environment that could be indicative of successful exploitation.

sigma tactics: execution techniques: T1059.004 sources: process_creation, azure

Detection queries are available on the platform. Get full rules →