PT-2026-52506 · Red Hat · Red Hat Build Of Keycloak

Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-9086

NVD

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-9086

Affected Products

Red Hat Build Of Keycloak

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-9086 · Security Note
• https://access.redhat.com/security/cve/CVE-2026-9086 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2480170 · Note