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CVE-2026-18217

Keycloak-services: keycloak-services: saml http-redirect binding response preserves query string leading to parameter pollution PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Red Hat / Red Hat Build of Keycloakaffected
Red Hat / Red Hat Build of Keycloakaffected
Red Hat / Red Hat Build of Keycloakaffected
Red Hat / Red Hat Data Grid 8unaffected
Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Packunaffected
Red Hat / Red Hat Single Sign-On 7unaffected

CWE

CWE-20

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.