CVE-2026-4819 floragunn CVE debrief

Who should care

Users of Search Guard FLX versions from 1.0.0 up to 4.0.1 should review their audit logging configurations and ensure that sensitive information is properly handled. System administrators, security teams, and operators responsible for managing Search Guard FLX deployments should be aware of this vulnerability and take necessary actions to mitigate the risk.

Technical summary

The audit logging feature in Search Guard FLX versions from 1.0.0 up to 4.0.1 might log user credentials from users logging into Kibana. This issue has a CVSS score of 4.9 and a severity of MEDIUM. The vulnerability is characterized by CWE-522 and CWE-532. The issue arises from the audit logging feature, which may inadvertently capture sensitive user credentials during the login process to Kibana.

Defensive priority

Medium priority should be given to updating Search Guard FLX to a version that does not log sensitive information in audit logs. Additionally, defenders should focus on monitoring and reviewing audit logs for potential credential exposure and implement compensating controls as necessary.

Recommended defensive actions

• Review and update Search Guard FLX to version 4.1.0 or later
• Configure audit logging to exclude sensitive information
• Monitor audit logs for potential credential exposure
• Implement additional security measures to protect user credentials
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD detail provide information on the vulnerability. The vendor has released a changelog and advisory regarding this issue. Search Guard FLX versions from 1.0.0 up to 4.0.1 are affected. Users should review their audit logging configurations and ensure that sensitive information is properly handled. The vulnerability is characterized by CWE-522 and CWE-532. There is no evidence of exploitation in the wild, but defenders should verify their systems and monitor for potential credential exposure.

Official resources