CVE-2026-9086 — Keycloak: keycloak: cross-site scripting (xss) via case-insensitive uri validation bypass
A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, co…
Published: 2026-06-25 · CVSS: 7.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7