CVE-2026-9589
CriticalCVSS 9.3Summary
Missing authorization in the configuration cascade operations of the Collaboration Server in Unblu Spark 7.0 through 8.36.1-hotfix.0, on on-premises and cloud deployments. An authenticated remote attacker can read and change configuration properties of entities they aren't authorized to access, including other users, accounts, and in Unblu Cloud other customers' accounts.
Risk Assessment
An authenticated attacker can modify configuration of other users and accounts, and in the cloud also other customers, breaking data isolation and configuration security.
Recommendation
Update Unblu Spark to a version later than 8.36.1-hotfix.0 and review configuration validation settings.
Other vulnerabilities in Unblu Spark
See all- CVE-2026-14933High
In the embedded co-browsing feature in Unblu Spark 7.0 through 7.57.7 and 8.0 through 8.39.2 (on-premises and cloud), an unauthenticated remote attacker in the visitor role can execute arbitrary JavaScript in the browser of an agent participating in the attacker's co-browsing session, via content rendered as HTML. The JavaScript runs in the context and under the identity of the agent's session in the Agent Desk or Single Conversation Desk. Exploitation requires an agent to join a session with the attacker; mobile co-apping is not affected.
- CVE-2026-8152Critical
Unblu Spark contains an open redirect vulnerability that can be escalated to a DOM-based XSS attack. When deployed with a specific configuration, it runs in the same origin as the host application, allowing an attacker full access to its resources.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS