VULNERABILITY INTELLIGENCE

CVE-2026-18217

CVSS score3.4 LOW
EPSS probability0.33%
CISA KEVNot currently listed
Published2026-07-31
Last modified2026-08-07
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:L/A:N

Description

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.

Weakness classification

  • secalert@redhat.com: CWE-20

Primary references