Vulnerability-Lookup

GHSA-M9MC-CHM4-QCPM

Vulnerability from github – Published: 2026-10-20 12:31 – Updated: 2026-10-20 12:31

Details

The Collaboration Server doesn't check whether the user reading or changing configuration has access to the entity the configuration belongs to. With certain non-default configuration validation settings, a registered user can additionally write configuration properties they aren't allowed to edit, in any scope.

Exploitation requires an authenticated session but no user interaction.

Severity

9.3 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-9589"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-20T11:17:35Z",
    "severity": "CRITICAL"
  },
  "details": "Missing authorization in the configuration cascade operations of the Collaboration Server in Unblu inc. Unblu Spark 7.0 through 8.36.1-hotfix.0, on on-premises and cloud deployments, allows an authenticated remote attacker to read and change configuration properties of entities they aren\u0027t authorized to access, including other users, other accounts and, in Unblu Cloud, other customers\u0027 accounts, via configuration read and write operations that target those entities.\n\n\n\nThe Collaboration Server doesn\u0027t check whether the user reading or changing configuration has access to the entity the configuration belongs to. With certain non-default configuration validation settings, a registered user can additionally write configuration properties they aren\u0027t allowed to edit, in any scope.\n\n\n\nExploitation requires an authenticated session but no user interaction.",
  "id": "GHSA-m9mc-chm4-qcpm",
  "modified": "2026-10-20T12:31:36Z",
  "published": "2026-10-20T12:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9589"
    },
    {
      "type": "WEB",
      "url": "https://docs.unblu.com/latest/security-bulletins/#UBL-2026-002"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:H/SA:H/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"
    }
  ]
}

CVE-2026-9589 (GCVE-0-2026-9589)

Vulnerability from cvelistv5 – Published: 2026-10-20 11:01 – Updated: 2026-10-20 15:36

Title

Unblu Spark Authorization Bypass in Configuration Cascade Operations

Summary

Missing authorization in the configuration cascade operations of the Collaboration Server in Unblu inc. Unblu Spark 7.0 through 8.36.1-hotfix.0, on on-premises and cloud deployments, allows an authenticated remote attacker to read and change configuration properties of entities they aren't authorized to access, including other users, other accounts and, in Unblu Cloud, other customers' accounts, via configuration read and write operations that target those entities. The Collaboration Server doesn't check whether the user reading or changing configuration has access to the entity the configuration belongs to. With certain non-default configuration validation settings, a registered user can additionally write configuration properties they aren't allowed to edit, in any scope. Exploitation requires an authenticated session but no user interaction.

Severity

9.3 (Critical)


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

8.9 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-20 15:35 UTC

CWE

CWE-862 - Missing Authorization
CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

NCSC.ch CNA under the mitre root

CNA scorecard B 80/100 over 76 records in the last 180 days details

References

1 reference

URL	Tags
https://docs.unblu.com/latest/security-bulletins/…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Unblu inc.	Unblu Spark	Affected: 7.0 , < 8.37.0 (semver)

Credits

Kenan Karalioglu (chef_shell) via YesWeHack

Show details on NVD website

JSON

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{
  "containers": {
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        "metrics": [
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                "id": "CVE-2026-9589",
                "options": [
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                  },
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                "role": "CISA Coordinator",
                "timestamp": "2026-10-20T15:35:28.675324Z",
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          "shortName": "CISA-ADP"
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          "value": "Kenan Karalioglu (chef_shell) via YesWeHack"
        }
      ],
      "descriptions": [
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              "value": "\u003cp\u003eMissing authorization in the configuration cascade operations of the Collaboration Server in Unblu inc. Unblu Spark 7.0 through 8.36.1-hotfix.0, on on-premises and cloud deployments, allows an authenticated remote attacker to read and change configuration properties of entities they aren\u0027t authorized to access, including other users, other accounts and, in Unblu Cloud, other customers\u0027 accounts, via configuration read and write operations that target those entities.\u003c/p\u003e\u003cp\u003eThe Collaboration Server doesn\u0027t check whether the user reading or changing configuration has access to the entity the configuration belongs to. With certain non-default configuration validation settings, a registered user can additionally write configuration properties they aren\u0027t allowed to edit, in any scope.\u003c/p\u003e\u003cp\u003eExploitation requires an authenticated session but no user interaction.\u003c/p\u003e"
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        }
      ],
      "impacts": [
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      "metrics": [
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        {
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              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-20T11:01:14.409Z",
        "orgId": "455daabc-a392-441d-aa46-37d35189897c",
        "shortName": "NCSC.ch"
      },
      "references": [
        {
          "name": "Unblu Security Advisories",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://docs.unblu.com/latest/security-bulletins/#UBL-2026-002"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
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        }
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    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}

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.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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