CVE-2026-18676 (GCVE-0-2026-18676)
Vulnerability from cvelistv5 – Published: 2026-08-12 18:42 – Updated: 2026-08-13 14:50
VLAI
EPSS
VEX
Title
Kong Mesh: default control plane config leaks the admin token cross-origin via a CORS wildcard and localhost admin
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:50 UTC
CWE
Assigner
References
8 references
Impacted products
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"title": "Kong Mesh: default control plane config leaks the admin token cross-origin via a CORS wildcard and localhost admin",
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"value": "Set KUMA_API_SERVER_AUTHN_LOCALHOST_IS_ADMIN=false after retrieving the admin token, set KUMA_API_SERVER_CORS_ALLOWED_DOMAINS to an explicit allowlist such as http://localhost:5681,http://127.0.0.1:5681, and do not run kuma-cp on a machine used to browse untrusted sites."
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[\"patch\"]}, {\"url\": \"https://github.com/kumahq/kuma/pull/16426\", \"name\": \"kumahq/kuma#16426 (backport)\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/kumahq/kuma/pull/16427\", \"name\": \"kumahq/kuma#16427 (backport)\", \"tags\": [\"patch\"]}, {\"url\": \"https://developer.konghq.com/mesh/changelog/\", \"name\": \"Kong MESH Changelog\", \"tags\": [\"release-notes\"]}], \"metrics\": [{\"format\": \"CVSS\", \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}], \"cvssV4_0\": {\"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"ACTIVE\", \"vulnConfidentialityImpact\": \"LOW\", \"subConfidentialityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"LOW\", \"subIntegrityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"exploitMaturity\": \"NOT_DEFINED\", \"Safety\": \"NOT_DEFINED\", \"Automatable\": \"NOT_DEFINED\", \"Recovery\": \"NOT_DEFINED\", \"valueDensity\": \"NOT_DEFINED\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"version\": \"4.0\", \"baseSeverity\": \"MEDIUM\", \"baseScore\": 5.1, \"vectorString\": \"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\"}}], \"configurations\": [{\"lang\": \"en\", \"value\": \"You are affected if all of the following hold:\\n\\n * kuma-cp runs with default config (corsAllowedDomains: [\\\".*\\\"] and localhostIsAdmin: true).\\n * The control plane is reachable from a browser on the same machine: kuma-cp run on a developer laptop, Docker with host networking or a published port on a workstation, or kubectl port-forward from a machine that also browses the web.\\n * The operator visits a page running attacker JavaScript while the control plane is reachable.\\n\\n\\n\\n\\nYou are not affected if:\\n\\n * The control plane runs on a Kubernetes cluster accessed over ClusterIP, NodePort, or LoadBalancer from a remote client.\\n * The control plane runs on an SSH-administered VM with no browser on the host.\\n * KUMA_API_SERVER_AUTHN_LOCALHOST_IS_ADMIN=false is set.\\n * KUMA_API_SERVER_CORS_ALLOWED_DOMAINS is set to an explicit allowlist that excludes attacker origins.\", \"supportingMedia\": [{\"type\": \"text/html\", \"base64\": false, \"value\": \"\u003cp\u003eYou are affected if all of the following hold:\u003c/p\u003e\u003cul\u003e\u003cli\u003e\u003ccode\u003ekuma-cp\u003c/code\u003e runs with default config (\u003ccode\u003ecorsAllowedDomains: [\u0026quot;.*\u0026quot;]\u003c/code\u003e and \u003ccode\u003elocalhostIsAdmin: true\u003c/code\u003e).\u003c/li\u003e\u003cli\u003eThe control plane is reachable from a browser on the same machine: \u003ccode\u003ekuma-cp run\u003c/code\u003e on a developer laptop, Docker with host networking or a published port on a workstation, or \u003ccode\u003ekubectl port-forward\u003c/code\u003e from a machine that also browses the web.\u003c/li\u003e\u003cli\u003eThe operator visits a page running attacker JavaScript while the control plane is reachable.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eYou are not affected if:\u003c/p\u003e\u003cul\u003e\u003cli\u003eThe control plane runs on a Kubernetes cluster accessed over ClusterIP, NodePort, or LoadBalancer from a remote client.\u003c/li\u003e\u003cli\u003eThe control plane runs on an SSH-administered VM with no browser on the host.\u003c/li\u003e\u003cli\u003e\u003ccode\u003eKUMA_API_SERVER_AUTHN_LOCALHOST_IS_ADMIN=false\u003c/code\u003e is set.\u003c/li\u003e\u003cli\u003e\u003ccode\u003eKUMA_API_SERVER_CORS_ALLOWED_DOMAINS\u003c/code\u003e is set to an explicit allowlist that excludes attacker origins.\u003c/li\u003e\u003c/ul\u003e\"}]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Set KUMA_API_SERVER_AUTHN_LOCALHOST_IS_ADMIN=false after retrieving the admin token, set KUMA_API_SERVER_CORS_ALLOWED_DOMAINS to an explicit allowlist such as http://localhost:5681,http://127.0.0.1:5681, and do not run kuma-cp on a machine used to browse untrusted sites.\", \"supportingMedia\": [{\"type\": \"text/html\", \"base64\": false, \"value\": \"\u003cp\u003eSet \u003ccode\u003eKUMA_API_SERVER_AUTHN_LOCALHOST_IS_ADMIN=false\u003c/code\u003e after retrieving the admin token, set \u003ccode\u003eKUMA_API_SERVER_CORS_ALLOWED_DOMAINS\u003c/code\u003e to an explicit allowlist such as \u003ccode\u003ehttp://localhost:5681,http://127.0.0.1:5681\u003c/code\u003e, and do not run \u003ccode\u003ekuma-cp\u003c/code\u003e on a machine used to browse untrusted sites.\u003c/p\u003e\"}]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade to Kong Mesh 2.7.25, 2.9.15, 2.11.13, 2.12.10 or 2.13.5, whichever matches your release line. In patched versions the corsAllowedDomains default changed from [\\\".*\\\"] to [], making CORS opt-in, and localhostIsAdmin was hardened to require a direct loopback RemoteAddr and Host and to reject requests carrying proxy-hop headers (X-Forwarded-For), cross-site fetch metadata (Sec-Fetch-Site), or a non-localhost Origin. The 2.14 line shipped after the fix and was never affected.\", \"supportingMedia\": [{\"type\": \"text/html\", \"base64\": false, \"value\": \"\u003cp\u003eUpgrade to Kong Mesh 2.7.25, 2.9.15, 2.11.13, 2.12.10 or 2.13.5, whichever matches your release line. In patched versions the \u003ccode\u003ecorsAllowedDomains\u003c/code\u003e default changed from \u003ccode\u003e[\u0026quot;.*\u0026quot;]\u003c/code\u003e to \u003ccode\u003e[]\u003c/code\u003e, making CORS opt-in, and \u003ccode\u003elocalhostIsAdmin\u003c/code\u003e was hardened to require a direct loopback \u003ccode\u003eRemoteAddr\u003c/code\u003e and \u003ccode\u003eHost\u003c/code\u003e and to reject requests carrying proxy-hop headers (\u003ccode\u003eX-Forwarded-For\u003c/code\u003e), cross-site fetch metadata (\u003ccode\u003eSec-Fetch-Site\u003c/code\u003e), or a non-localhost \u003ccode\u003eOrigin\u003c/code\u003e. The 2.14 line shipped after the fix and was never affected.\u003c/p\u003e\"}]}], \"timeline\": [{\"time\": \"2026-05-01T07:01:00.000Z\", \"lang\": \"en\", \"value\": \"Kong Mesh patched releases published\"}, {\"time\": \"2026-05-09T06:15:00.000Z\", \"lang\": \"en\", \"value\": \"Upstream advisory GHSA-3vcp-chfh-f6r2 published\"}], \"credits\": [{\"lang\": \"en\", \"value\": \"eldudareeno\", \"type\": \"finder\"}], \"source\": {\"discovery\": \"EXTERNAL\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-18676\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-13T14:50:34.609630Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-13T14:50:40.227Z\"}}]}",
"cveMetadata": "{\"cveId\": \"CVE-2026-18676\", \"assignerOrgId\": \"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Kong\", \"dateReserved\": \"2026-08-03T15:20:44.526Z\", \"datePublished\": \"2026-08-12T18:42:38.843Z\", \"dateUpdated\": \"2026-08-13T14:50:43.069Z\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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