What’s Vulnerable › Vulnerabilities

CVE-2026-18676: Kong Mesh: default control plane config leaks the admin token cross-origin via a CORS wildcard and localhost admin

• Severity: medium (CVSS 5.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-12 · updated 2026-10-23
• Weakness: CWE-346

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.

Affected products

• Kong Inc. Kong Mesh: before 2.7.25; from 2.8.0 before 2.9.15; from 2.10.0 before 2.11.13; from 2.12.0 before 2.12.10; from 2.13.0 before 2.13.5 — fixed in 2.11.13, 2.12.10, 2.13.5, 2.7.25, 2.9.15

How to fix

Upgrade to a fixed version: Kong Inc. Kong Mesh 2.11.13, 2.12.10, 2.13.5, 2.7.25. Check the vendor advisory for mitigations.

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

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