CVE-2026-9086 — Vulnerability intelligence
Red Hat — org.keycloak:keycloak-services
Published:
- CVSS
- 7.3
- CISA KEV
- Not listed; not proof of no exploitation
Original source text (not a translation)
Keycloak vulnerable to cross-site scripting (xss) via case-insensitive uri validation bypass
### Description
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.