Unauthenticated network privilege escalation
Published May 18, 2026 · Updated May 18, 2026
Improper authentication in Microsoft Azure Local before 2604.2.25645 and Azure Resource Manager allows remote attackers to elevate privileges. Microsoft has not published the authentication locus or the operation that mishandles unauthenticated network requests. No prior privileges or user interaction are required; the reported consequence is privilege escalation in the network-reachable control plane.
Summary
What happened
Improper authentication in Microsoft Azure Local before 2604.2.25645 and Azure Resource Manager allows remote attackers to elevate privileges. Microsoft has not published the authentication locus or the operation that mishandles unauthenticated network requests. No prior privileges or user interaction are required; the reported consequence is privilege escalation in the network-reachable control plane.
The record
- CVE
- CVE-2026-42822
- Published
- May 18, 2026
- Updated
- May 18, 2026
- Vendor
- Microsoft
- Product
- Azure Stack HCI
- Classifications
- CWE-287, T1068
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 18, 2026CVE publishedPublication date reported by the CVE source.
- May 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0.0 <2604.2.25645
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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