Cloudanix VulnDB

CVE-2026-9086

High · 7.3

CVSS

7.3

EPSS

0.8%

Published

Jun 25, 2026

CISA due date

—

The record

A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.

Affected packages

Ecosystem Package Introduced Fixed

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