CVE-2026-8152 Unblu Spark Open Redirect leading to DOM-Based XSS
Attackers can exploit an open redirect to trigger DOM-based XSS, potentially accessing host application data when embedded setup is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-8152?
CVE-2026-8152 is a critical cross-site scripting vulnerability in Unblu Spark, published on 22 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-8152?
How do I fix CVE-2026-8152?
No fix has been published for CVE-2026-8152 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-8152 being exploited?
There is no known exploitation of CVE-2026-8152 in the wild and no public exploit code.
Sources
Also known as GHSA-6f3h-gqrm-69gc.