Description
It was found that Keycloak's Node.js adapter before version 4.8.3 did not properly verify the web token received from the server in its backchannel logout . An attacker with local access could use this to construct a malicious web token setting an NBF parameter that could prevent user access indefinitely.
Remediation
References
http://www.securityfocus.com/bid/108734
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10157
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