CVE-2026-9589 (GCVE-0-2026-9589)
Vulnerability from cvelistv5 – Published: 2026-10-20 11:01 – Updated: 2026-10-20 15:36
VLAI
EPSS
VEX
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
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-20 15:35 UTC
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://docs.unblu.com/latest/security-bulletins/… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Unblu inc. | Unblu Spark |
Affected:
7.0 , < 8.37.0
(semver)
|
guessed |
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