CVE-2023-6563

An unconstrained memory consumption vulnerability was discovered in Keycloak. It can be triggered in environments which have millions of offline tokens (> 500,000 users with each having at least 2 saved sessions). If an attacker creates two or more user sessions and then open the "consents" tab of the admin User Interface, the UI attempts to load a huge number of offline client sessions leading to excessive memory and CPU consumption which could potentially crash the entire system.

Score
CVSS 3.1 7.7 High
Status
Modified - secalert@redhat.com
Published
2023-12-14
Last modified
2026-09-22
Weaknesses
CWE-770

Affected products

References

 
 
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