{"id":"GO-2026-5102","revision":null,"records":[{"revision":"45ad29d998094e709eaab5cb476da392","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-18676","aliases":[],"title":"Kong Mesh: default control plane config leaks the admin token cross-origin via a CORS wildcard and localhost admin","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.\u00A0Due to a CORS misconfiguration a cross-origin fetch() from a malicious page returns the admin JWT and signing material.","state":0,"publishedAt":"2026-08-12T18:42:38.843+00:00","modifiedAt":"2026-08-13T14:50:43.069+00:00","affected":[{"ecosystem":"Vendor product","name":"Kong Mesh","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Kong Inc.\",\n                    \"product\": \"Kong Mesh\",\n                    \"platforms\": [\n                        \"Linux\"\n                    ],\n                    \"modules\": [\n                        \"kuma-cp\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.7.25\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.8.0\",\n                            \"lessThan\": \"2.9.15\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.10.0\",\n                            \"lessThan\": \"2.11.13\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.12.0\",\n                            \"lessThan\": \"2.12.10\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.13.0\",\n                            \"lessThan\": \"2.13.5\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":5.1,"severity":"MEDIUM"}],"references":["https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2","https://github.com/kumahq/kuma/pull/16416","https://github.com/kumahq/kuma/pull/16423","https://github.com/kumahq/kuma/pull/16424","https://github.com/kumahq/kuma/pull/16425","https://github.com/kumahq/kuma/pull/16426","https://github.com/kumahq/kuma/pull/16427","https://developer.konghq.com/mesh/changelog/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-18676","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-18676","identifiers":["CVE-2026-18676"]},"retained":false,"historicalAffected":[]},{"revision":"28472bd651444e7eba92747b6cc0dd34","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-45021","aliases":[],"title":"Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin","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.","state":0,"publishedAt":"2026-05-28T17:45:14.434+00:00","modifiedAt":"2026-05-28T19:30:33.327+00:00","affected":[{"ecosystem":"Vendor product","name":"kuma","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"kumahq\",\n                    \"product\": \"kuma\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.7.25\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2.9.0, < 2.9.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2.11.0, < 2.11.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2.12.0, < 2.12.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2.13.0, < 2.13.5\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":5.1,"severity":"MEDIUM"}],"references":["https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2","https://github.com/kumahq/kuma/pull/16416","https://github.com/kumahq/kuma/pull/16423","https://github.com/kumahq/kuma/pull/16424","https://github.com/kumahq/kuma/pull/16425","https://github.com/kumahq/kuma/pull/16426","https://github.com/kumahq/kuma/pull/16427","https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-45021","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-45021","identifiers":["CVE-2026-45021"]},"retained":false,"historicalAffected":[]},{"revision":"eb99e90431cd459793bdf98d93bc06dc","observedAt":"2026-11-07T13:22:44.627+00:00","statement":{"source":"euvd","id":"EUVD-2026-32966","aliases":["CVE-2026-45021","GHSA-3vcp-chfh-f6r2"],"title":"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 …","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","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","score":5.1,"severity":null}],"references":["https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2","https://github.com/kumahq/kuma/pull/16416","https://github.com/kumahq/kuma/pull/16423","https://github.com/kumahq/kuma/pull/16424","https://github.com/kumahq/kuma/pull/16425","https://github.com/kumahq/kuma/pull/16426","https://github.com/kumahq/kuma/pull/16427","https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-32966","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 28, 2026, 5:45:14 PM","dateUpdated":"May 28, 2026, 7:30:33 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-18676","identifiers":["CVE-2026-18676"]},"retained":false,"historicalAffected":[]},{"revision":"336a46403f834dccb560e80c98f7cde7","observedAt":"2026-10-27T11:12:23.45+00:00","statement":{"source":"nvd","id":"CVE-2026-45021","aliases":[],"title":"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 …","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. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-45021","identifiers":["CVE-2026-45021"]},"retained":false,"historicalAffected":[]},{"revision":"a38e84d8fa024b86aac3a4081212fccf","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-3vcp-chfh-f6r2","aliases":["CVE-2026-18676","CVE-2026-45021","GO-2026-5102"],"title":"Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin","description":"## Summary\n\nDefault `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.\n\n## Am I affected?\n\nYou are affected if all of these hold:\n\n1. `kuma-cp` runs with default config (`CorsAllowedDomains: [\".*\"]` and `LocalhostIsAdmin: true`).\n2. The control plane is reachable from a browser on the same machine:\n   - `kuma-cp run` on a developer laptop\n   - Docker `--network host` or port-publish on a workstation\n   - `kubectl port-forward` from a machine that also browses the web\n3. The operator visits a page running attacker JavaScript while the control plane is reachable.\n\nYou are not affected if:\n\n- The control plane runs on a Kubernetes cluster accessed via 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 (see https://kuma.io/docs/latest/production/secure-deployment/api-server-auth/).\n- `KUMA_API_SERVER_CORS_ALLOWED_DOMAINS` is set to an explicit allowlist that excludes attacker origins.\n\n## Mitigation\n\n1. Set `KUMA_API_SERVER_AUTHN_LOCALHOST_IS_ADMIN=false` after retrieving the admin token.\n2. Set `KUMA_API_SERVER_CORS_ALLOWED_DOMAINS` to an explicit allowlist, for example `http://localhost:5681,http://127.0.0.1:5681`.\n3. Do not run `kuma-cp` on a machine where you browse untrusted sites.\n\n## Fix\n\nFixed in [#16416](https://github.com/kumahq/kuma/pull/16416), backported to all supported release branches ([#16423](https://github.com/kumahq/kuma/pull/16423), [#16424](https://github.com/kumahq/kuma/pull/16424), [#16425](https://github.com/kumahq/kuma/pull/16425), [#16426](https://github.com/kumahq/kuma/pull/16426), [#16427](https://github.com/kumahq/kuma/pull/16427)).\n\nChanges in patched versions:\n\n- `CorsAllowedDomains` default changed from `[\".*\"]` to `[]` — CORS is now opt-in; set the env var explicitly if you need GUI access.\n- `LocalhostIsAdmin` hardened: now requires direct loopback `RemoteAddr` and `Host`, and rejects requests carrying proxy-hop headers (`X-Forwarded-For`), cross-site fetch metadata (`Sec-Fetch-Site`), or a non-localhost `Origin`.\n\nUpgrade to a patched version:\n\n- 2.7.25\n- 2.9.15\n- 2.11.13\n- 2.12.10\n- 2.13.5\n\n## Credits\n\nReported by `eldudareeno`.\n\n## CVSS\n\n`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` = 5.1 Medium.","state":0,"publishedAt":"2026-05-14T20:15:08+00:00","modifiedAt":"2026-09-10T03:50:45.3467903+00:00","affected":[{"ecosystem":"Go","name":"github.com/kumahq/kuma","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.7.25"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/kumahq/kuma","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.9.0"},{"kind":"fixed","version":"2.9.15"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/kumahq/kuma","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.11.0"},{"kind":"fixed","version":"2.11.13"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/kumahq/kuma","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.12.0"},{"kind":"fixed","version":"2.12.10"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/kumahq/kuma","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.13.0"},{"kind":"fixed","version":"2.13.5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2","https://nvd.nist.gov/vuln/detail/CVE-2026-45021","https://github.com/kumahq/kuma/pull/16416","https://github.com/kumahq/kuma/pull/16423","https://github.com/kumahq/kuma/pull/16424","https://github.com/kumahq/kuma/pull/16425","https://github.com/kumahq/kuma/pull/16426","https://github.com/kumahq/kuma/pull/16427","https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907","https://github.com/kumahq/kuma"],"sourceUrl":"https://github.com/advisories/GHSA-3vcp-chfh-f6r2","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-3vcp-chfh-f6r2","identifiers":["GHSA-3vcp-chfh-f6r2","CVE-2026-18676","CVE-2026-45021","GO-2026-5102"]},"retained":false,"historicalAffected":[]},{"revision":"0ff6c9c0dbd84ee2a7792c39b2df96a6","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5102","aliases":["CVE-2026-18676","CVE-2026-45021","GHSA-3vcp-chfh-f6r2"],"title":"Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin in github.com/kumahq/kuma","description":"Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin in github.com/kumahq/kuma.\n\nNOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.\n\n(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)\n\nThe additional affected modules and versions are: github.com/kumahq/kuma/v2 from v2.9.0 before 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