{"api_version":"1","generated_at":"2026-06-02T09:42:33+00:00","cve":"CVE-2026-45021","urls":{"html":"https://cve.report/CVE-2026-45021","api":"https://cve.report/api/cve/CVE-2026-45021.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-45021","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45021"},"summary":{"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":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-05-28 18:16:34","updated_at":"2026-05-28 18:56:36"},"problem_types":["CWE-346","CWE-942","CWE-346 CWE-346: Origin Validation Error","CWE-942 CWE-942: Permissive Cross-domain Policy with Untrusted Domains"],"metrics":[{"version":"4.0","source":"security-advisories@github.com","type":"Secondary","score":"5.1","severity":"MEDIUM","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","data":{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":5.1,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}},{"version":"4.0","source":"CNA","type":"DECLARED","score":"5.1","severity":"MEDIUM","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","data":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","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","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"}}],"references":[{"url":"https://github.com/kumahq/kuma/pull/16424","name":"https://github.com/kumahq/kuma/pull/16424","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/kumahq/kuma/pull/16416","name":"https://github.com/kumahq/kuma/pull/16416","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/kumahq/kuma/pull/16423","name":"https://github.com/kumahq/kuma/pull/16423","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907","name":"https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/kumahq/kuma/pull/16427","name":"https://github.com/kumahq/kuma/pull/16427","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2","name":"https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/kumahq/kuma/pull/16425","name":"https://github.com/kumahq/kuma/pull/16425","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/kumahq/kuma/pull/16426","name":"https://github.com/kumahq/kuma/pull/16426","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45021","name":"CVE 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2.13.5","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"45021","cve":"CVE-2026-45021","epss":"0.000220000","percentile":"0.064240000","score_date":"2026-06-01","updated_at":"2026-06-02 00:05:20"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"kuma","vendor":"kumahq","versions":[{"status":"affected","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"}]}],"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."}],"metrics":[{"cvssV4_0":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","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","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","description":"CWE-346: Origin Validation Error","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-942","description":"CWE-942: Permissive Cross-domain Policy with Untrusted Domains","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-05-28T17:45:14.434Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"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"}],"source":{"advisory":"GHSA-3vcp-chfh-f6r2","discovery":"UNKNOWN"},"title":"Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-45021","datePublished":"2026-05-28T17:45:14.434Z","dateReserved":"2026-05-08T16:58:28.896Z","dateUpdated":"2026-05-28T17:45:14.434Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-28 18:16:34","lastModifiedDate":"2026-05-28 18:56:36","problem_types":["CWE-346","CWE-942","CWE-346 CWE-346: Origin Validation Error","CWE-942 CWE-942: Permissive Cross-domain Policy with Untrusted Domains"],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":5.1,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"45021","Ordinal":"1","Title":"Kuma: Default kuma-cp leaks admin token cross-origin via CORS wi","CVE":"CVE-2026-45021","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"45021","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Kuma: Default kuma-cp leaks admin token cross-origin via CORS wi"}]}}}