CVE-2026-66803
Azure Cosmos DB Remote Code Execution Vulnerability
CRITICAL
10
CVSS Score
Published: July 30, 2026 at 08:28 PM UTC
Updated: October 28, 2026 at 08:07 PM UTC
1 product affected across 1 vendorAzure Cosmos DB
Using Azure Cosmos DB by Microsoft?
Get instant alerts when new vulnerabilities affect Azure Cosmos DB - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
CRITICAL10
Exploit prediction
EPSS 0.9%
SSVC
No known exploit
Description
Improper access control in Azure Cosmos DB allows an unauthorized attacker to execute code over a network.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66803SSVC — Action Prioritization
SSVCNo known exploitAutomatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
10CRITICALmicrosoft
Vector?
Quick Info
StatusANALYZED
CWE
CWE-284
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card