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

{
    "lastseen": "",
    "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.",
    "published": "2026-05-28T17:45:14.434Z",
    "modified": "2026-05-28T17:45:14.434Z",
    "type": "cve",
    "title": "Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin",
    "source": "GitHub_M",
    "references": "https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2\nhttps://github.com/kumahq/kuma/pull/16416\nhttps://github.com/kumahq/kuma/pull/16423\nhttps://github.com/kumahq/kuma/pull/16424\nhttps://github.com/kumahq/kuma/pull/16425\nhttps://github.com/kumahq/kuma/pull/16426\nhttps://github.com/kumahq/kuma/pull/16427\nhttps://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907",
    "id": "CVE-2026-45021",
    "bulletinFamily": "",
    "cwe": [
        "CWE-346",
        "CWE-942"
    ],
    "cvelist": null,
    "sourceData": "kumahq kuma < 2.7.25\nkumahq kuma >= 2.9.0, < 2.9.15\nkumahq kuma >= 2.11.0, < 2.11.13\nkumahq kuma >= 2.12.0, < 2.12.10\nkumahq kuma >= 2.13.0, < 2.13.5",
    "sourceHref": "",
    "cvss": {
        "score": 5.1,
        "severity": "MEDIUM",
        "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "kuma",
    "version": "< 2.7.25",
    "vendor": "kumahq",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}