An issue was discovered by Elastic whereby sensitive information may be recorded in Kibana logs in the event of an error or in the event where debug level logging is enabled in Kibana. Elastic has released Kibana 8.11.2 which resolves this issue. The messages recorded in the log may contain:

- Account credentials for the kibana_system user, API Keys, and credentials of Kibana end-users.
- Elastic Security package policy objects which can contain private keys, bearer token, and sessions of 3rd-party integrations.
- Authorization headers, client secrets, local file paths, and stack traces

The issue may occur in any Kibana instance running an affected version (which are listed below) that could potentially receive an unexpected error when communicating to Elasticsearch causing it to include sensitive data into Kibana error logs. It could also occur under specific circumstances when debug level logging is enabled in Kibana.

Note: It was found that the fix for ESA-2023-25 in Kibana 8.11.1 for a similar issue was incomplete.

Affected Versions:

Kibana versions on or after 7.13.0 and before 7.17.16.
Kibana versions on or after 8.0.0 and before 8.11.2.

Solutions and Mitigations:

The issue is resolved in Kibana 8.11.2 and 7.17.16

References:
https://discuss.elastic.co/t/kibana-8-11-2-7-17-16-security-update-esa-2023-27/349182