What is CVE-2026-85878?

CVE-2026-85878 is a critical-severity vulnerability in Microsoft Azure Horizondb, classified under Improper Authorization. CVSS score: 9.9/10. Published 2026-09-18.

How severe is CVE-2026-85878?

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

Auth bypass in Microsoft Azure Horizondb

CVE-2026-85878

Improper authorization in Azure Database for PostgreSQL allows an authorized attacker to elevate privileges over a network.

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.

Affected products

Microsoft Azure Horizondb

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-85878?: CVE-2026-85878 is a critical-severity vulnerability in Microsoft Azure Horizondb, classified under Improper Authorization. CVSS score: 9.9/10. Published 2026-09-18.
How severe is CVE-2026-85878?: Critical severity. CVSS v3 base score is 9.9 out of 10.