Detect nebula-mesh API Ownership Check Bypass — Cross-Operator Privilege Escalation in IBM QRadar
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
QRadar Detection Query
SELECT
sourceip,
username,
UTF8(payload) AS raw_payload,
COUNT(*) AS request_count,
UNIQUECOUNT(REGEXP_EXTRACT(UTF8(payload), '/api/v[0-9]+/[^/]+/([^/?\s]+)', 1)) AS distinct_resource_ids,
MIN(starttime) AS first_request_epoch,
MAX(starttime) AS last_request_epoch,
'CVE-2026-47724' AS cve_id
FROM events
WHERE
LOGSOURCETYPENAME(devicetype) IN ('Apache HTTP Server', 'nginx', 'F5 BIG-IP', 'Application Log')
AND UTF8(payload) MATCHES '.*\/api\/v[0-9]+\/(nodes|networks|tunnels|hosts|peers)\/[^/\s]+.*'
AND UTF8(payload) MATCHES '.*(200|201|204).*'
AND UTF8(payload) MATCHES '.*(PUT|PATCH|DELETE|GET).*'
AND LOGSOURCETIME(starttime) > NOW() - 3600000
GROUP BY
sourceip,
username,
FLOOR(starttime / 600000)
HAVING
distinct_resource_ids > 5
ORDER BY distinct_resource_ids DESC
LAST 60 MINUTESQRadar AQL query aggregating nebula-mesh API requests by source IP and username across 10-minute windows, flagging actors accessing more than 5 distinct resource IDs — a key indicator of cross-operator access exploitation in CVE-2026-47724.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate mesh administrators performing multi-node configuration updates
- Automated deployment pipelines with broad API access
- Asset discovery tools enumerating mesh topology
- Backup or export tools accessing all mesh resources
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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