Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin
Kuma is a modern Envoy-based service mesh that can run on every cloud across both Kubernetes and VMs. Prior to 2.7.25, 2.9.15, 2.11.13, 2.12.10, and 2.13.5, the default kuma-cp config leaks the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their browser. CorsAllowedDomains: [".*"] reflects any Origin, and LocalhostIsAdmin: true promotes requests from 127.0.0.1 to mesh-system:admin. A cross-origin fetch() from a malicious page returns the admin JWT and signing material. This vulnerability is fixed in 2.7.25, 2.9.15, 2.11.13, 2.12.10, and 2.13.5.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-18676US | — | — | ||
The default kuma-cp configuration in Kong Mesh reveals the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45021.jsonADVISORY
- https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907FIX
- https://github.com/kumahq/kuma/pull/16416FIX
- https://github.com/kumahq/kuma/pull/16423FIX
- https://github.com/kumahq/kuma/pull/16424FIX
- https://github.com/kumahq/kuma/pull/16425FIX
- https://github.com/kumahq/kuma/pull/16426FIX
- https://github.com/kumahq/kuma/pull/16427FIX
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