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.
Advisories

No advisories yet.

Fixes

Solution

Upgrade to Unblu Spark 8.37.2 or later. There is no fix for Unblu Spark 7.x. Unblu Cloud customers needn't take any action. The fix is already deployed in Unblu Cloud. There is no workaround for on-premises deployments.


Workaround

No workaround given by the vendor.

History

Tue, 20 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 20 Oct 2026 12:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Unblu Spark Authorization Bypass in Configuration Cascade Operations
Weaknesses CWE-639
CWE-862
References
Metrics cvssV4_0

{'score': 8.9, 'vector': '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: NCSC.ch

Published:

Updated: 2026-10-20T15:36:00.992Z

Reserved: 2026-05-26T13:09:34.301Z

Link: CVE-2026-9589

cve-icon Vulnrichment

Updated: 2026-10-20T15:35:53.297Z

cve-icon NVD

Status : Received

Published: 2026-10-20T11:17:35.770

Modified: 2026-10-20T16:17:19.547

Link: CVE-2026-9589

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-20T15:45:16Z

Weaknesses