Detect nebula-mesh API Ownership Check Bypass — Cross-Operator Privilege Escalation in Sumo Logic CSE
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
Sumo Detection Query
_sourceCategory=nebula-mesh OR _sourceCategory=nginx/access OR _sourceCategory=application/golang
| parse regex "(?P<http_method>GET|POST|PUT|PATCH|DELETE) (?P<request_uri>/api/v\d+/(?P<resource_type>nodes|networks|tunnels|hosts|peers)/(?P<resource_id>[^/?\s]+))"
| parse regex "(?P<status_code>[245]\d{2})"
| parse regex "(?P<source_ip>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})"
| where status_code in ("200", "201", "204") and http_method in ("GET", "PUT", "PATCH", "DELETE")
| timeslice 10m
| stats
count as request_count,
dcount(resource_id) as distinct_resources,
dcount(resource_type) as distinct_resource_types,
values(http_method) as methods
by source_ip, _timeslice
| where distinct_resources > 5
| sort by distinct_resources desc
| fields _timeslice, source_ip, request_count, distinct_resources, distinct_resource_types, methodsSumo Logic query detecting nebula-mesh API abuse patterns consistent with CVE-2026-47724, by identifying source IPs accessing more than 5 distinct resource IDs across ownership-unprotected endpoints within 10-minute bins.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate operators with global administrative privileges managing large deployments
- Automated mesh monitoring or telemetry collection systems
- DevOps pipelines executing bulk mesh configuration changes
- Security tooling performing authorized API surface enumeration
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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