It was discovered that Kibana’s JIRA connector & IBM Resilient connector could be used to return HTTP response data on internal hosts, which may be intentionally hidden from public view. Using this vulnerability, a malicious user with the ability to create connectors, could utilize these connectors to view limited HTTP response data on hosts accessible to the cluster.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-37939
• https://discuss.elastic.co/t/kibana-7-15-2-security-update/288923