CVE-2026-8152

Unblu Spark Open Redirect leading to DOM-Based XSS

State: Published
Severity: 9.3 Critical
Published: Jul 22, 2026
Updated: Jul 22, 2026
Reserved: May 8, 2026

Description

Unblu Spark contains an open redirect vulnerability that can be escalated to a DOM-based cross-site scripting (XSS) attack.

When Unblu Spark is deployed with com.unblu.identifier.siteEmbeddedSetup=true, it runs in the same origin as the host application. Any JavaScript injected through this vulnerability therefore executes with full access to the host application's cookies, DOM, and same-origin APIs — an attacker can reach all resources of the host application, not just Unblu's. This expanded blast radius is the reason on-premises deployments using this configuration are rated CRITICAL.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N	NCSC.ch
4.0	7.0 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N	NCSC.ch

Weaknesses

CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
Unblu SparkUnblu inc.	8.36.1 and earlierAffected 8.36.1-hotfix.0Not affected 8.37.0Not affected

References

Unblu Security Advisoriesvendor-advisory

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