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CVE-2026-45021— Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin

AI Predicted 9.8 Difficulty: Easy EPSS 0.02% · P6

Possible ATT&CK Techniques 1AI

T1530 · Data from Cloud Storage

Affected Version Matrix 5

VendorProductVersion RangeStatus
kumahqkuma< 2.7.25affected
>= 2.9.0, < 2.9.15affected
>= 2.11.0, < 2.11.13affected
>= 2.12.0, < 2.12.10affected
>= 2.13.0, < 2.13.5affected
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I. Basic Information for CVE-2026-45021

Vulnerability Information
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Vulnerability Title
Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin
Source: NVD (National Vulnerability Database)
Vulnerability Description
Kuma is a modern Envoy-based service mesh that can run on every cloud across both Kubernetes and VMs. Prior to 2.7.25, 2.9.15, 2.11.13, 2.12.10, and 2.13.5, the default kuma-cp config leaks the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their browser. CorsAllowedDomains: [".*"] reflects any Origin, and LocalhostIsAdmin: true promotes requests from 127.0.0.1 to mesh-system:admin. A cross-origin fetch() from a malicious page returns the admin JWT and signing material. This vulnerability is fixed in 2.7.25, 2.9.15, 2.11.13, 2.12.10, and 2.13.5.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
源验证错误
Source: NVD (National Vulnerability Database)
Vulnerability Title
Kuma 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kuma是Kuma开源的一个基于 Envoy 的现代服务网格。可以在 Kubernetes 和 VM 上以单区或多区容量在每个云上运行。 Kuma 2.7.25之前版本、2.9.15之前版本、2.11.13之前版本、2.12.10之前版本和2.13.5之前版本存在安全漏洞，该漏洞源于默认配置允许跨域请求泄露管理员引导令牌和签名密钥。
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

VendorProductAffected VersionsCPESubscribe
kumahqkuma < 2.7.25 -

II. Public POCs for CVE-2026-45021

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III. Intelligence Information for CVE-2026-45021

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Patches & Fixes for CVE-2026-45021 (7)

Vendor Advisories for CVE-2026-45021 (1)

IV. Related Vulnerabilities

Same weakness: CWE-346

V. Comments for CVE-2026-45021

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