Vulnerability-Lookup

CVE-2026-11857 (GCVE-0-2026-11857)

Vulnerability from cvelistv5 – Published: 2026-06-17 11:42 – Updated: 2026-06-17 14:56

Title

Insecure .NET Remoting deserialization in Quanos SCHEMA ST4 Client Update Service allows local privilege escalation

Summary

Quanos SCHEMA ST4 on-premises contains a local privilege escalation vulnerability in the Client Update Service due to insecure deserialization in the .NET Remoting service. The service is configured with TypeFilterLevel.Full and is bound to local interfaces only through named pipes. A local authenticated attacker can connect to the local named pipe, obtain the .NET Remoting endpoint, and send specially crafted serialized objects. Successful exploitation results in arbitrary code execution in the context of the update process with NT AUTHORITY\SYSTEM privileges. Network-only exploitation is not possible and local host access with an authenticated user session is required.

Severity

8.4 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-502 - Deserialization of untrusted data

Assigner

SEC-VLab

References

1 reference

URL	Tags
https://r.sec-consult.com/quanos

Impacted products

1 product

Vendor	Product	Version
Quanos Solutions GmbH	SCHEMA ST4	Affected: SCHEMA ST4 on-premises, all versions (custom)

Credits

Johannes Kruchem, SEC Consult Vulnerability Lab

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-11857

Vulnerability from fkie_nvd - Published: 2026-06-17 13:19 - Updated: 2026-06-17 16:21

Severity

8.4 (High) - CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	551230f0-3615-47bd-b7cc-93e92e730bbf	https://r.sec-consult.com/quanos

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "affected",
          "product": "SCHEMA ST4",
          "vendor": "Quanos Solutions GmbH",
          "versions": [
            {
              "status": "affected",
              "version": "SCHEMA ST4 on-premises, all versions",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "551230f0-3615-47bd-b7cc-93e92e730bbf"
    }
  ],
  "cveTags": [],
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    {
      "lang": "en",
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    }
  ],
  "id": "CVE-2026-11857",
  "lastModified": "2026-06-17T16:21:32.403",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
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          "Recovery": "NOT_DEFINED",
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          "attackRequirements": "NONE",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
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          "vulnIntegrityImpact": "HIGH",
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        "source": "551230f0-3615-47bd-b7cc-93e92e730bbf",
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}

GHSA-FMX7-JMR3-4JW2

Vulnerability from github – Published: 2026-06-17 18:35 – Updated: 2026-06-17 18:35

Details

Severity

8.4 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-11857"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-17T13:19:33Z",
    "severity": "HIGH"
  },
  "details": "Quanos SCHEMA ST4 on-premises contains a local privilege escalation vulnerability in the Client Update Service due to insecure deserialization in the .NET Remoting service. The service is configured with TypeFilterLevel.Full and is bound to local interfaces only through named pipes. A local authenticated attacker can connect to the local named pipe, obtain the .NET Remoting endpoint, and send specially crafted serialized objects. Successful exploitation results in arbitrary code execution in the context of the update process with NT AUTHORITY\\SYSTEM privileges. Network-only exploitation is not possible and local host access with an authenticated user session is required.",
  "id": "GHSA-fmx7-jmr3-4jw2",
  "modified": "2026-06-17T18:35:45Z",
  "published": "2026-06-17T18:35:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11857"
    },
    {
      "type": "WEB",
      "url": "https://r.sec-consult.com/quanos"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-11857 (GCVE-0-2026-11857)

FKIE_CVE-2026-11857

GHSA-FMX7-JMR3-4JW2

Tags

Sightings

Nomenclature