by Kastro
Paper/Archive/CVE-2026-8152

CVE-2026-8152

Unblu inc. Unblu Spark — Unblu Spark Open Redirect leading to DOM-Based XSS

EPSS 0.4%CVSS 9.3
critical.is priorityof 100
35
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 35.7.357 × 207.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Unblu Spark≤ 8.36.18.36.1-hotfix.0CNA

Scores by source

NCSC.ch (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

advisorydocs.unblu.com/latest/security-bulletins/#UBL-2026-001