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CVE-2026-9589— Unblu Spark Authorization Bypass in Configuration Cascade Operations

Quick assessment

Affected
Unblu inc. Unblu Spark
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Unblu Inc. 的 Unblu Spark 7.0 至 8.36.1-hotfix.0 版本中，协作服务器（Collaboration Server）在配置级联操作（configuration cascade operations）中存在授权缺失漏洞。该漏洞影响本地部署和云部署环境，允许已认证的远程攻击者通过针对特定实体的配置读写操作，读取和修改其无权访问的实体配置属性，包括其他用户、其他账户，以及在 Unblu Cloud 环境中其他客户的账户。 该协作服务器未验证执行配置读取或修改操作的用户是否拥有对所属

CVSS 8.9 · High
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I. Basic Information for CVE-2026-9589

Vulnerability Information
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Vulnerability Title
Unblu Spark Authorization Bypass in Configuration Cascade Operations
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unblu inc. Unblu Spark 7.0 ~ 8.37.0 -

II. Public POCs for CVE-2026-9589

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III. Intelligence Information for CVE-2026-9589

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Other References for CVE-2026-9589 (1)

IV. Related Vulnerabilities

Same product: Unblu Spark
Same vendor: Unblu inc.
Same weakness: CWE-862

V. Comments for CVE-2026-9589

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