CVE-2026-18676

medium

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://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2

https://github.com/kumahq/kuma/pull/16427

https://github.com/kumahq/kuma/pull/16426

https://github.com/kumahq/kuma/pull/16425

https://github.com/kumahq/kuma/pull/16424

https://github.com/kumahq/kuma/pull/16423

https://github.com/kumahq/kuma/pull/16416

https://developer.konghq.com/mesh/changelog/

Details

Source: Mitre, NVD

Published: 2026-08-12

Updated: 2026-08-31

Risk Information

CVSS v2

Base Score: 5.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 8.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Severity: High

CVSS v4

Base Score: 5.1

Vector: 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

Severity: Medium

EPSS

EPSS: 0.0023