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

Quick assessment

Affected
Kong Inc. Kong Mesh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kuma是Kuma组织开源的一个基于 Envoy 的现代化服务网格，可在任何云平台上运行，支持单区域或多区域部署，并兼容 Kubernetes 和虚拟机。 Kuma 2.7.25之前版本、2.8.0至2.9.15之前版本、2.10.0至2.11.13之前版本、2.12.0至2.12.10之前版本和2.13.0至2.13.5之前版本存在安全漏洞，该漏洞源于CORS配置错误，可能导致恶意页面的跨域请求获取管理员JWT和签名材料。

CVSS 5.1 · Medium EPSS 0.30% · P21

Affected Version Matrix 5

VendorProduct Version RangeStatus
Kong Inc. Kong Mesh < 2.7.25 affected
2.8.0< 2.9.15 affected
2.10.0< 2.11.13 affected
2.12.0< 2.12.10 affected
2.13.0< 2.13.5 affected
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I. Basic Information for CVE-2026-18676

Vulnerability Information
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Vulnerability Title
Kong Mesh: default control plane config leaks the admin token cross-origin via a CORS wildcard and localhost admin
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Kuma 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kuma是Kuma组织开源的一个基于 Envoy 的现代化服务网格，可在任何云平台上运行，支持单区域或多区域部署，并兼容 Kubernetes 和虚拟机。 Kuma 2.7.25之前版本、2.8.0至2.9.15之前版本、2.10.0至2.11.13之前版本、2.12.0至2.12.10之前版本和2.13.0至2.13.5之前版本存在安全漏洞，该漏洞源于CORS配置错误，可能导致恶意页面的跨域请求获取管理员JWT和签名材料。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Kong Inc. Kong Mesh 0 ~ 2.7.25 -

II. Public POCs for CVE-2026-18676

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III. Intelligence Information for CVE-2026-18676

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Patches & Fixes for CVE-2026-18676 (7)

Vendor Advisories for CVE-2026-18676 (1)

Same Patch Batch · Kong Inc. · 2026-08-12 · 6 CVEs total

CVE-2026-18677 6.0 MEDIUM Kong Mesh: a dataplane token without a workload binding can claim any workload's SPIFFE id
CVE-2026-18679 5.8 MEDIUM Kong Mesh: kuma-dp connects to the control plane without verifying the TLS certificate whe
CVE-2026-18678 5.5 MEDIUM Kong Mesh: kumactl connects to the control plane without verifying the TLS certificate whe
CVE-2026-18673 5.3 MEDIUM Kong Mesh: the kuma-dp readiness service exposes the Envoy admin API without authenticatio
CVE-2026-18675 5.3 MEDIUM Kong Mesh: control plane denial of service via a malformed dataplane token with a non-stri

IV. Related Vulnerabilities

Same product: Kong Mesh
Same vendor: Kong Inc.
Same weakness: CWE-346

V. Comments for CVE-2026-18676

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