{"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": "2026-05-28T17:45:14.434Z"}, "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"}}}}

{}

{"cveTags": [], "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."}], "id": "CVE-2026-45021", "lastModified": "2026-05-28T18:16:34.167", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.1, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-05-28T18:16:34.167", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907"}, {"source": "security-advisories@github.com", "url": "https://github.com/kumahq/kuma/pull/16416"}, {"source": "security-advisories@github.com", "url": "https://github.com/kumahq/kuma/pull/16423"}, {"source": "security-advisories@github.com", "url": "https://github.com/kumahq/kuma/pull/16424"}, {"source": "security-advisories@github.com", "url": "https://github.com/kumahq/kuma/pull/16425"}, {"source": "security-advisories@github.com", "url": "https://github.com/kumahq/kuma/pull/16426"}, {"source": "security-advisories@github.com", "url": "https://github.com/kumahq/kuma/pull/16427"}, {"source": "security-advisories@github.com", "url": "https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-346"}, {"lang": "en", "value": "CWE-942"}], "source": "security-advisories@github.com", "type": "Primary"}]}

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