Local privilege escalation via unauthorized update methods
Published Jun 17, 2026 · Updated Jun 17, 2026
Local privilege escalation in Quanos SCHEMA ST4 on-premises allows local users to write or delete arbitrary files as SYSTEM. The Client Update Service exposes privileged Update() methods through a .NET Remoting named-pipe endpoint without access control or authentication. Local host access through an authenticated low-privileged account is required; cloud and SaaS deployments do not contain the update service.
Summary
What happened
Local privilege escalation in Quanos SCHEMA ST4 on-premises allows local users to write or delete arbitrary files as SYSTEM. The Client Update Service exposes privileged Update() methods through a .NET Remoting named-pipe endpoint without access control or authentication. Local host access through an authenticated low-privileged account is required; cloud and SaaS deployments do not contain the update service.
The record
- CVE
- CVE-2026-11858
- Published
- Jun 17, 2026
- Updated
- Jun 17, 2026
- Vendor
- Quanos Solutions GmbH
- Product
- SCHEMA ST4
- Classifications
- CWE-862, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 17, 2026CVE publishedPublication date reported by the CVE source.
- Jun 17, 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=SCHEMA ST4 on-premises, all versions
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.
Public exploit references
- SEC Consult local named-pipe proof of conceptproof of concept · demonstrated
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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