CVE-2026-9589

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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.\n\n\n\nThe 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.\n\n\n\nExploitation requires an authenticated session but no user interaction.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>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.</p><p>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.</p><p>Exploitation requires an authenticated session but no user interaction.</p>"}]}], "references": [{"url": "https://docs.unblu.com/latest/security-bulletins/#UBL-2026-002", "name": "Unblu Security Advisories", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "Unblu Cloud"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.3, "vectorString": "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"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "On-premises deployment"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.9, "vectorString": "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"}}], "solutions": [{"lang": "en", "value": "Upgrade to Unblu Spark 8.37.2 or later. There is no fix for Unblu Spark 7.x.\n\n\n\nUnblu Cloud customers needn't take any action. The fix is already deployed in Unblu Cloud.\n\n\n\nThere is no workaround for on-premises deployments.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Upgrade to Unblu Spark 8.37.2 or later. There is no fix for Unblu Spark 7.x.</p><p>Unblu Cloud customers needn't take any action. The fix is already deployed in Unblu Cloud.</p><p>There is no workaround for on-premises deployments.</p>"}]}], "credits": [{"lang": "en", "value": "Kenan Karalioglu (chef_shell) via YesWeHack", "type": "finder"}], "source": {"advisory": "UBL-2026-002", "discovery": "EXTERNAL"}, "x_generator": {"engine": "manual"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-20T15:35:28.675324Z", "id": "CVE-2026-9589", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-20T15:36:00.992Z"}}]}}

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There is no fix for Unblu Spark 7.x.\n\n\n\nUnblu Cloud customers needn't take any action. The fix is already deployed in Unblu Cloud.\n\n\n\nThere is no workaround for on-premises deployments.", "supportingMedia": [{"type": "text/html", "value": "<p>Upgrade to Unblu Spark 8.37.2 or later. There is no fix for Unblu Spark 7.x.</p><p>Unblu Cloud customers needn't take any action. The fix is already deployed in Unblu Cloud.</p><p>There is no workaround for on-premises deployments.</p>", "base64": false}]}], "references": [{"url": "https://docs.unblu.com/latest/security-bulletins/#UBL-2026-002", "name": "Unblu Security Advisories", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "manual"}, "descriptions": [{"lang": "en", "value": "Missing authorization in the configuration cascade operations of the Collaboration Server in Unblu inc. 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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.</p><p>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.</p><p>Exploitation requires an authenticated session but no user interaction.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-862", "description": "CWE-862 Missing Authorization"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-639", "description": "CWE-639 Authorization Bypass Through User-Controlled Key"}]}], "providerMetadata": {"orgId": "455daabc-a392-441d-aa46-37d35189897c", "shortName": "NCSC.ch", "dateUpdated": "2026-10-20T11:01:14.409Z"}}}, "cveMetadata": {"cveId": "CVE-2026-9589", "state": "PUBLISHED", "dateUpdated": "2026-10-20T15:36:00.992Z", "dateReserved": "2026-05-26T13:09:34.301Z", "assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c", "datePublished": "2026-10-20T11:01:14.409Z", "assignerShortName": "NCSC.ch"}, "dataVersion": "5.2"}

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{}

{"affected": [{"configurations": [{"platform": ["on-premises", "cloud"], "status": "affected", "versions": {"scheme": "semver", "value": "[7.0,8.37.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Unblu Spark", "source": "cna", "vendor": "Unblu inc."}, "product": "spark", "vendor": "unblu"}], "created": "2026-10-20T15:45:16.287068+00:00", "updated": "2026-10-21T16:45:21.818180+00:00", "vendors": ["unblu", "unblu$PRODUCT$spark"]}