What is CVE-2026-33109?

CVE-2026-33109 is a critical-severity vulnerability in Microsoft Azure Managed Instance For Apache Cassandra, classified under Improper Access Control. CVSS score: 9.9/10. Published 2026-05-07.

How severe is CVE-2026-33109?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Vulnerability in Microsoft Azure Managed Instance For Apache Cassandra

CVE-2026-33109

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

Published 2026-05-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (54.3th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

Azure Managed Instance for Apache Cassandra Remote Code Execution Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33109?: CVE-2026-33109 is a critical-severity vulnerability in Microsoft Azure Managed Instance For Apache Cassandra, classified under Improper Access Control. CVSS score: 9.9/10. Published 2026-05-07.
How severe is CVE-2026-33109?: Critical severity. CVSS v3 base score is 9.9 out of 10.