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.
References8
- developer.konghq.com/mesh/changelog/
- github.com/kumahq/kuma/pull/16416
- github.com/kumahq/kuma/pull/16423
- github.com/kumahq/kuma/pull/16424
- github.com/kumahq/kuma/pull/16425
- github.com/kumahq/kuma/pull/16426
- github.com/kumahq/kuma/pull/16427
- github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2
Metrics
- CVSS 4.0
-
5.1
MEDIUM
Score source: CNA
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 23 · as of 12 November 2026
- CWE
- CWE-346CWE-942
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.