CVE-2026-45021
Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin
- State
- Published
- Severity
- 5.1 Medium
- Published
- May 28, 2026
- Updated
- May 28, 2026
- Reserved
- May 8, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
kumakumahq |
|
References
- https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2
- https://github.com/kumahq/kuma/pull/16416
- https://github.com/kumahq/kuma/pull/16423
- https://github.com/kumahq/kuma/pull/16424
- https://github.com/kumahq/kuma/pull/16425
- https://github.com/kumahq/kuma/pull/16426
- https://github.com/kumahq/kuma/pull/16427
- https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907
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