# CVE-2026-18676

## Summary

- **CVE ID:** CVE-2026-18676
- **Severity:** MEDIUM
- **CVSS Score:** 5.1 (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)
- **CWE:** CWE-346, CWE-942
- **Published:** Aug 12, 2026
- **Last Modified:** Aug 13, 2026

## 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 (0)
- Kong Inc. — Kong Mesh (2.8.0)
- Kong Inc. — Kong Mesh (2.10.0)
- Kong Inc. — Kong Mesh (2.12.0)
- Kong Inc. — Kong Mesh (2.13.0)

## References

- [CNA](https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2)
- [CNA](https://github.com/kumahq/kuma/pull/16416)
- [CNA](https://github.com/kumahq/kuma/pull/16423)
- [CNA](https://github.com/kumahq/kuma/pull/16424)
- [CNA](https://github.com/kumahq/kuma/pull/16425)
- [CNA](https://github.com/kumahq/kuma/pull/16426)
- [CNA](https://github.com/kumahq/kuma/pull/16427)
- [CNA](https://developer.konghq.com/mesh/changelog/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.23%
- **EPSS Percentile:** 13.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._