{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45021","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-05-08T16:58:28.896Z","datePublished":"2026-05-28T17:45:14.434Z","dateUpdated":"2026-05-28T19:30:33.327Z"},"containers":{"cna":{"title":"Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin","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"}]}],"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"}}],"references":[{"name":"https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2"},{"name":"https://github.com/kumahq/kuma/pull/16416","tags":["x_refsource_MISC"],"url":"https://github.com/kumahq/kuma/pull/16416"},{"name":"https://github.com/kumahq/kuma/pull/16423","tags":["x_refsource_MISC"],"url":"https://github.com/kumahq/kuma/pull/16423"},{"name":"https://github.com/kumahq/kuma/pull/16424","tags":["x_refsource_MISC"],"url":"https://github.com/kumahq/kuma/pull/16424"},{"name":"https://github.com/kumahq/kuma/pull/16425","tags":["x_refsource_MISC"],"url":"https://github.com/kumahq/kuma/pull/16425"},{"name":"https://github.com/kumahq/kuma/pull/16426","tags":["x_refsource_MISC"],"url":"https://github.com/kumahq/kuma/pull/16426"},{"name":"https://github.com/kumahq/kuma/pull/16427","tags":["x_refsource_MISC"],"url":"https://github.com/kumahq/kuma/pull/16427"},{"name":"https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907","tags":["x_refsource_MISC"],"url":"https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907"}],"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"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-05-28T17:45:14.434Z"},"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."}],"source":{"advisory":"GHSA-3vcp-chfh-f6r2","discovery":"UNKNOWN"}},"adp":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-28T19:30:33.327Z"}}]}}