PT-2026-66729 · Red Hat · Red Hat Build Of Keycloak+3

CVE-2026-18217 · Published 2026-07-31 · Updated 2026-07-31

NVD

CVSS v3.1

3.4

Low

Base vector

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

A flaw was found in the SAML protocol implementation of Keycloak, an open-source identity and access management solution. The issue occurs when Keycloak handles SAML authentication requests using the HTTP-Redirect binding. If a client is configured with a wildcard redirect URL, an attacker can craft a request that includes malicious parameters. When a user authenticates, Keycloak appends its legitimate response to the attacker's parameters. This can cause some service providers to process the attacker's data instead of the real login information, potentially leading to a user being logged into the wrong account.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-18217

Affected Products

Red Hat Build Of Keycloak

Red Hat Data Grid 8

Red Hat Jboss Enterprise Application Platform Expansion Pack

Red Hat Single Sign-On 7

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-18217 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2508311 · Note
• https://access.redhat.com/security/cve/CVE-2026-18217 · Note