CVE-2026-18676

Description

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 browser. Due to a CORS misconfiguration a cross-origin fetch() from a malicious page returns the admin JWT and signing material.

References

• https://developer.konghq.com/mesh/changelog/
• 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/security/advisories/GHSA-3vcp-chfh-f6r2