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VulnerabilityCVE-2026-85878Published 2026-09-17

CVE-2026-85878 — Microsoft Azure HorizonDB

critical

As of 2026-10-08, CVE-2026-85878 is a CRITICAL-severity vulnerability in Microsoft Azure HorizonDB, CVSS v3.1 9.9, EPSS 0.7% (54.5th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-85878, most recently “Microsoft September 2026 Cloud Disclosure: 18 Elevation-of-Privilege, Information-Disclosure, and Spoofing Flaws Across Azure and Copilot AI Products, Plus a Windows Secure Kernel EoP (CVE-2026-85921)”.

CVSS v3.1
9.9/10Critical
EPSS
0.7%Higher than 54.5% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
7.1/10Threadlinqs triage score
Published
Updated 2026-10-08
CVSS v3.1 9.9 (CRITICAL) · EPSS 0.7% (higher than 54.5% of all scored CVEs) · Priority 7.1/10 · Published 2026-09-17

Last updated:

What is CVE-2026-85878?

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

The record classifies CVE-2026-85878 under weakness class CWE-285. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 37 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.9 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
EPSS (FIRST)
0.7% probability of exploitation in the next 30 days, higher than 54.5% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
7.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-09-17, last modified 2026-10-08

Is CVE-2026-85878 being exploited?

It currently carries a trending score of 43 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-85878

No vendor patch reference has been recorded for CVE-2026-85878 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-85878

1 tracked threat in the Threadlinqs corpus references CVE-2026-85878, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on .

Vendor advisory and patch