VULNERABILITY INTELLIGENCE

CVE-2026-9086

CVSS score7.3 HIGH
EPSS probability0.78%
CISA KEVNot currently listed
Published2026-06-25
Last modified2026-07-15
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

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.

Weakness classification

  • secalert@redhat.com: CWE-79
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-79

Primary references