Detect nebula-mesh API Ownership Check Bypass — Cross-Operator Privilege Escalation in Elastic Security
CVE-2026-47724 is a missing authorization vulnerability (CWE-862) in github.com/juev/nebula-mesh versions prior to 0.3.4. API endpoints fail to validate resource ownership before processing requests, allowing an authenticated operator to access, modify, or delete mesh network resources belonging to other operators. With a CVSS score of 9.9 and a public proof-of-concept, exploitation enables full cross-tenant privilege escalation within a nebula-mesh deployment. Organizations running nebula-mesh as a multi-tenant overlay network orchestrator are at critical risk.
MITRE ATT&CK
Elastic Detection Query
sequence by source.ip, user.name with maxspan=10m
[network where
http.request.method in ("GET", "PUT", "PATCH", "DELETE") and
url.path : "/api/v*/nodes/*" or
url.path : "/api/v*/networks/*" or
url.path : "/api/v*/tunnels/*" or
url.path : "/api/v*/hosts/*" or
url.path : "/api/v*/peers/*" and
http.response.status_code in (200, 201, 204)
] with runs=6EQL sequence query detecting a single source IP and user making 6 or more successful API requests to distinct nebula-mesh resource path types within a 10-minute window, indicating potential CVE-2026-47724 exploitation.
Data Sources
Required Tables
False Positives & Tuning
- Automated mesh provisioning tools making legitimate bulk API calls
- Monitoring agents polling multiple nebula-mesh endpoints simultaneously
- Legitimate operators with wide administrative scope accessing many resources
- Load balancer health checks hitting multiple API endpoints
Other platforms for CVE-2026-47724
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1CVE-2026-47724: Enumerate Foreign Operator Nodes via Unauthenticated Ownership Check
Expected signal: HTTP GET /api/v1/nodes/<operator_b_node_id> returning HTTP 200 with node details for a resource not owned by the authenticated operator
- Test 2CVE-2026-47724: Modify Foreign Operator Network Configuration
Expected signal: HTTP PATCH /api/v1/networks/<foreign_network_id> returning HTTP 200, with data store reflecting updated network name owned by wrong operator
- Test 3CVE-2026-47724: Delete Foreign Operator Tunnel — Destructive Escalation
Expected signal: HTTP DELETE /api/v1/tunnels/<foreign_tunnel_id> returning HTTP 200 or 204, followed by mesh connectivity disruption between the tunnel's associated endpoints
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