Description
A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.
Problem types
Improper Validation of Consistency within Input
Product status
Timeline
| 2026-05-27: | Reported to Red Hat. |
| 2026-05-27: | Made public. |
Credits
Red Hat would like to thank Martin Bartoš for reporting this issue.
References
access.redhat.com/security/cve/CVE-2026-9689
bugzilla.redhat.com/show_bug.cgi?id=2481845 (RHBZ#2481845)