{"id":"CVE-2026-45021","aliases":["GHSA-3vcp-chfh-f6r2","GO-2026-5102"],"url":"https://o3.security/vulnerability/CVE-2026-45021","summary":"Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin","details":"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":"2026-08-08T09:26:58.056039460Z","cvss":null,"epss":{"score":0.00204,"percentile":0.10484,"asOf":"2026-08-09"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/kumahq/kuma","fixedVersion":"2.7.25"},{"ecosystem":"Go","name":"github.com/kumahq/kuma","fixedVersion":"2.9.15"},{"ecosystem":"Go","name":"github.com/kumahq/kuma","fixedVersion":"2.11.13"},{"ecosystem":"Go","name":"github.com/kumahq/kuma","fixedVersion":"2.12.10"},{"ecosystem":"Go","name":"github.com/kumahq/kuma","fixedVersion":"2.13.5"}],"fix":{"url":"https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907","label":"kumahq/kuma@8fefa85"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45021.json"},{"type":"ADVISORY","url":"https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45021"},{"type":"FIX","url":"https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907"},{"type":"FIX","url":"https://github.com/kumahq/kuma/pull/16416"},{"type":"FIX","url":"https://github.com/kumahq/kuma/pull/16423"},{"type":"FIX","url":"https://github.com/kumahq/kuma/pull/16424"},{"type":"FIX","url":"https://github.com/kumahq/kuma/pull/16425"},{"type":"FIX","url":"https://github.com/kumahq/kuma/pull/16426"},{"type":"FIX","url":"https://github.com/kumahq/kuma/pull/16427"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-08T09:26:58.056039460Z"}}