CVE-2026-33109

CRITICALNVD 9.99.9—

9.9

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

CVSS v3: 9.9
EG Score: 9.9(high)
EPSS: 21.6%
KEV: Not listed

Published

May 7, 2026

Last Modified

May 8, 2026

Advisory Details (1)

Auto-updated May 16, 2026

Patch available. Sources: microsoft.

microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33109

Vendor Advisories for CVE-2026-33109(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-33109
Microsoft Security Response Center (MSRC)Remote Code Execution
Azure Managed Instance for Apache Cassandra Remote Code Execution Vulnerability

Frequently asked(5)

What is CVE-2026-33109?

CVE-2026-33109 is a critical vulnerability published on May 7, 2026. Improper access control in Azure Managed Instance for Apache Cassandra allows an authorized attacker to execute code over a network.

When was CVE-2026-33109 disclosed?

CVE-2026-33109 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on May 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-33109 actively exploited?

CVE-2026-33109 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-33109?

CVE-2026-33109 has a CVSS v3 base score of 9.9 (NVD).

How do I remediate CVE-2026-33109?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33109, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-33109

📅 Published

🔄 Last Modified

📋 Advisory Details (1)