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Intro (How CVE-2026-49093 works)
CVE-2026-49093 is a Server‑Side Request Forgery (SSRF) vulnerability in Kibana’s connector management functionality. It allows an authenticated user with connector management privileges to bypass the operator‑configured connector allowlist. The flaw exists because Kibana does not properly validate destination URLs when processing connector configurations. An attacker can supply a maliciously crafted connector definition that the server then uses to make outbound requests. Because the system fails to enforce the allowlist at request time, the attacker can force the Kibana server to send requests to arbitrary destinations that should have been blocked by egress controls. The vulnerability operates at the application layer and can be exploited through seemingly legitimate connector configurations. The attacker can access internal systems, exfiltrate sensitive data, or establish command‑and‑control channels. The root cause is insufficient validation of input URLs combined with inadequate enforcement of network egress restrictions. The flaw has been assigned CWE‑918 and is present in Kibana versions 9.3.0 through 9.3.2. The NIST CVSS 3.1 base score is 7.7 (High), while Elastic’s own score is 6.3 (Medium). The vulnerability was disclosed on 2026‑05‑28, and patches were made available in version 9.3.3.
DailyCVE Form
Platform: Kibana
Version: 9.3.0–9.3.2
Vulnerability: SSRF allowlist bypass
Severity: Medium (6.3 CVSS)
Date: 2026‑05‑28
Prediction: 2026‑04‑08
What Undercode Say
Check Kibana version
curl -s -u username:password 'http://<kibana_host>:5601/api/status' | jq '.version.number'
Exploit snippet (craft connector with internal target)
curl -X POST 'http://<kibana_host>:5601/api/connectors' \
-H 'Content-Type: application/json' \
-H 'Authorization: ApiKey <your_api_key>' \
-d '{
"name": "malicious_connector",
"config": {
"url": "http://169.254.169.254/latest/meta-data/"
}
}'
Apply the patch by upgrading to 9.3.3
sudo yum update kibana or apt, docker pull, etc.
Exploit
An authenticated attacker with connector management privileges creates a new connector whose `url` parameter points to an internal resource (e.g., a cloud metadata service). When Kibana processes this connector, it does not validate the destination against the allowlist and sends an outbound request to the internal endpoint. The attacker can read the response, thereby exfiltrating sensitive data or mapping the internal network.
Protection
- Upgrade Kibana to version 9.3.3 or later (the fixed release).
- Enforce strict input validation for all connector configuration parameters.
- Run Kibana with the principle of least privilege; limit connector management permissions.
- Implement network egress controls (e.g., firewall rules) that apply even if a SSRF occurs.
- Monitor audit logs for unexpected outbound connections and workflow executions.
Impact
- Data Exfiltration: Sensitive information from internal systems (metadata endpoints, internal APIs) can be stolen.
- Network Reconnaissance: Attackers can map internal services and discover vulnerable endpoints.
- Bypass of Security Controls: Operator‑configured egress allowlists are rendered ineffective, undermining network segmentation.
- Lateral Movement: Internal resources exposed via the SSRF can be used as stepping stones for further attacks.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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