{"id":"CVE-2026-45021","sourceIdentifier":"security-advisories@github.com","published":"2026-05-28T18:16:34.167","lastModified":"2026-06-17T10:51:36.840","vulnStatus":"Deferred","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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"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"}]}]}],"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"}}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-28T19:30:17.834875Z","id":"CVE-2026-45021","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-346"},{"lang":"en","value":"CWE-942"}]}],"references":[{"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","source":"security-advisories@github.com"}]}