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Vulnerability of Keycloak: privilege escalation via Backchannel Logout

Synthesis of the vulnerability 

An attacker can bypass restrictions via Backchannel Logout of Keycloak, in order to escalate his privileges.
Impacted products: Red Hat SSO.
Severity of this bulletin: 2/4.
Creation date: 20/05/2021.
Références of this threat: CVE-2021-3461, RHSA-2021:2063-01, RHSA-2021:2064-01, RHSA-2021:2065-01, RHSA-2021:2070-01, VIGILANCE-VUL-35499.

Description of the vulnerability 

An attacker can bypass restrictions via Backchannel Logout of Keycloak, in order...
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This computer vulnerability alert impacts software or systems such as Red Hat SSO.

Our Vigil@nce team determined that the severity of this computer threat alert is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this security vulnerability.

Solutions for this threat 

Patches for this vulnerability are not yet public.
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