CVEvulnerability

CVE-2026-18217

4.7 MEDIUM Published 2026-07-31 Modified 2026-08-07 Official page ↗
Status
Analyzed
Published
2026-07-31
Last modified
2026-08-07
Assigner
[email protected]
CVSS 3.1 ([email protected])
3.4 LOW — CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:L/A:N
CVSS 3.1 ([email protected])
4.7 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Weaknesses
CWE-20

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.

Affected configurations

• redhat build of keycloak

Related

Weakness · CWE (1)

  • CWE-20 Improper Input Validation weakness

References