Open redirect in Keycloak - CVE-2020-10734
Published: April 25, 2022 / Updated: June 29, 2026
Vulnerability identifier: #VU135684
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-10734
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to redirect users to an untrusted site.
The vulnerability exists due to open redirect in the OIDC logout endpoint when handling logout requests without an id_token_hint. A remote attacker can send a specially crafted logout request to redirect users to an untrusted site.
The endpoint does not have CSRF protection.
Affected software
Keycloak
How to mitigate CVE-2020-10734
Install security update from vendor's website.
Keycloak - update to 18.0.0