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TI-2026-76784 Aliases CVE-2026-9589GHSA-m9mc-chm4-qcpm

Missing authorization in Unblu Spark configuration cascade operations

Priority MEDIUM 42CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

Unblu Spark from 7.0 before 8.37.0 has missing authorization in the configuration cascade operations of the Collaboration Server (CWE-862). The server does not check whether a user has access to the entity that a configuration belongs to. An authenticated remote attacker can read and change configuration properties of other users, other accounts and, in Unblu Cloud, other customers' accounts, without user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00359 29th percentileScored 2026-11-07
Fix Fixed Unblu Spark (Unblu inc.): 8.37.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Unblu inc.Unblu Spark7.0 to before 8.37.08.37.0Patch availableCNA
  • Unblu Spark VendorUnblu inc. Affected 7.0 to before 8.37.0 Fixed in 8.37.0 Patch available CNA

Remediation

Upgrade Unblu Spark to version 8.37.0 or later, which fixes this flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Unblu Spark (Unblu inc.) Fixed in 8.37.0

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-9589
  2. 2026-10-20 Alias added: GHSA-m9mc-chm4-qcpm
  3. 2026-10-20 CISA SSVC decision points changed
  4. 2026-10-20 Priority changed: MEDIUM → LOW
  5. 2026-10-22 Priority changed: LOW → MEDIUM

References

Advisory 1

  • TI-2026-76785 Cross-site scripting in Unblu Spark embedded co-browsing CVSS 4.0HIGH 8.6
  • TI-2026-07180 Unblu Spark Open Redirect leading to DOM-Based XSS CVSS 4.0CRITICAL 9.3
  • TI-2025-03091 Replace uploaded files knowing the file upload ID CVSS 4.0HIGH 7.0
  • TI-2025-03090 File upload functionality possible even when disabled CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences