CVE-2026-4819
MediumCVSS 4.9Exploitation Probability (EPSS)
Low risk12th percentile - higher than 12% of all known CVEs
Summary
In Search Guard FLX from version 1.0.0 up to 4.0.1, a vulnerability was found where the audit logging feature might log user credentials from users logging into Kibana.
Risk Assessment
The risk involves potential leakage of passwords or authentication tokens to log files, which could lead to unauthorized access.
Recommendation
It is recommended to upgrade to a version above 4.0.1 and review audit configuration to avoid logging sensitive data.
Other vulnerabilities in Search Guard FLX
See all- CVE-2026-4818Medium
Search Guard FLX versions 3.0.0 through 4.0.1 allow users without the necessary privileges to execute management operations on data streams.
- CVE-2026-4799Medium
Search Guard FLX up to version 4.0.1 allows redirecting users to an untrusted URL via specially crafted requests.
- CVE-2025-13653Medium
In Search Guard FLX versions from 3.1.0 up to 4.0.0 with enterprise modules disabled, authenticated users can use specially crafted requests to read documents from data streams without having the respective privileges.
- CVE-2025-12149Medium
In Search Guard FLX versions 3.1.2 and earlier, when a search is triggered from a Signals watch, the Document-Level Security (DLS) rule is not enforced, allowing access to all documents in the queried indices, despite DLS being correctly enforced elsewhere.
- CVE-2025-12147Medium
In Search Guard FLX versions 3.1.1 and earlier, Field-Level Security (FLS) rules are improperly enforced on object-valued fields. When an FLS exclusion rule (e.g., ~field) is applied to a field which contains an object as its value, the object is correctly removed from the _source returned by search operations. However, the object members (i.e., child attributes) remain accessible to search queries. This exposure allows adversaries to infer or reconstruct the original contents of the excluded object.
Original NVD description (English source)
In Search Guard FLX versions from 1.0.0 up to 4.0.1, the audit logging feature might log user credentials from users logging into Kibana.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS