{"id":"CVE-2026-45021","state":"PUBLISHED","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.","publishedAt":"2026-05-28T17:45:14.434Z","updatedAt":"2026-05-28T19:30:33.327Z","severity":{"score":5.1,"label":"Medium","version":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["kumahq kuma"],"affected":[{"vendor":"kumahq","product":"kuma","versions":[{"version":"< 2.7.25","status":"affected"},{"version":">= 2.9.0, < 2.9.15","status":"affected"},{"version":">= 2.11.0, < 2.11.13","status":"affected"},{"version":">= 2.12.0, < 2.12.10","status":"affected"},{"version":">= 2.13.0, < 2.13.5","status":"affected"}]}],"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"],"weaknesses":["CWE-346","CWE-942"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45021.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45021","state":"PUBLISHED","datePublished":"2026-05-28T17:45:14.434Z","dateUpdated":"2026-05-28T19:30:33.327Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-08T16:58:28.896Z"},"containers":{"cna":{"title":"Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"kumahq","product":"kuma","versions":[{"version":"< 2.7.25","status":"affected"},{"version":">= 2.9.0, < 2.9.15","status":"affected"},{"version":">= 2.11.0, < 2.11.13","status":"affected"},{"version":">= 2.12.0, < 2.12.10","status":"affected"},{"version":">= 2.13.0, < 2.13.5","status":"affected"}]}],"references":[{"url":"https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2","name":"https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/kumahq/kuma/pull/16416","name":"https://github.com/kumahq/kuma/pull/16416","tags":["x_refsource_MISC"]},{"url":"https://github.com/kumahq/kuma/pull/16423","name":"https://github.com/kumahq/kuma/pull/16423","tags":["x_refsource_MISC"]},{"url":"https://github.com/kumahq/kuma/pull/16424","name":"https://github.com/kumahq/kuma/pull/16424","tags":["x_refsource_MISC"]},{"url":"https://github.com/kumahq/kuma/pull/16425","name":"https://github.com/kumahq/kuma/pull/16425","tags":["x_refsource_MISC"]},{"url":"https://github.com/kumahq/kuma/pull/16426","name":"https://github.com/kumahq/kuma/pull/16426","tags":["x_refsource_MISC"]},{"url":"https://github.com/kumahq/kuma/pull/16427","name":"https://github.com/kumahq/kuma/pull/16427","tags":["x_refsource_MISC"]},{"url":"https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907","name":"https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.1,"baseSeverity":"MEDIUM","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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","lang":"en","description":"CWE-346: Origin Validation Error","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-942","lang":"en","description":"CWE-942: Permissive Cross-domain Policy with Untrusted Domains","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-28T17:45:14.434Z"},"source":{"advisory":"GHSA-3vcp-chfh-f6r2","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-28T19:30:17.834875Z","id":"CVE-2026-45021","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-28T19:30:33.327Z"}}]}}}