{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-61682", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-10T18:36:58.848Z", "datePublished": "2026-09-18T16:11:46.443Z", "dateUpdated": "2026-09-18T16:11:46.443Z"}, "containers": {"cna": {"title": "kcp front-proxy does not strip inbound X-Remote-* identity headers, allowing any authenticated client to inject groups/warrants and impersonate system:masters in any workspace", "problemTypes": [{"descriptions": [{"cweId": "CWE-290", "lang": "en", "description": "CWE-290: Authentication Bypass by Spoofing", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-302", "lang": "en", "description": "CWE-302: Authentication Bypass by Assumed-Immutable Data", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-348", "lang": "en", "description": "CWE-348: Use of Less Trusted Source", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4"}, {"name": "https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca", "tags": ["x_refsource_MISC"], "url": "https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca"}, {"name": "https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeff", "tags": ["x_refsource_MISC"], "url": "https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeff"}, {"name": "https://github.com/kcp-dev/kcp/releases/tag/v0.31.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/kcp-dev/kcp/releases/tag/v0.31.4"}, {"name": "https://github.com/kcp-dev/kcp/releases/tag/v0.32.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/kcp-dev/kcp/releases/tag/v0.32.2"}], "affected": [{"vendor": "kcp-dev", "product": "kcp", "versions": [{"version": "< 0.31.4", "status": "affected"}, {"version": ">= 0.32.0, < 0.32.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-18T16:11:46.443Z"}, "descriptions": [{"lang": "en", "value": "kcp is a Kubernetes-like control plane for form-factors and use-cases beyond Kubernetes and container workloads. Prior to 0.31.4 and 0.32.2, the kcp front-proxy does not remove inbound X-Remote-User, X-Remote-Group, or X-Remote-Extra-* identity headers before forwarding requests to shards. Any authenticated tenant can inject X-Remote-Group: system:masters, authorization.kcp.io/warrant, authentication.kcp.io/scopes, or a group used for per-workspace required-group gating, and the shard trusts these values as authenticated identity assertions. This allows cross-workspace impersonation, authorization bypass, and arbitrary reading, writing, or deletion of resources, secrets, RBAC data, APIExports, APIBindings, and LogicalClusters. This issue is fixed in versions 0.31.4 and 0.32.2."}], "source": {"advisory": "GHSA-c8w2-fgvx-vhv4", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "kcp", "vendor": "kcp-dev", "versions": [{"status": "affected", "version": "< 0.31.4"}, {"status": "affected", "version": ">= 0.32.0, < 0.32.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "kcp is a Kubernetes-like control plane for form-factors and use-cases beyond Kubernetes and container workloads. Prior to 0.31.4 and 0.32.2, the kcp front-proxy does not remove inbound X-Remote-User, X-Remote-Group, or X-Remote-Extra-* identity headers before forwarding requests to shards. Any authenticated tenant can inject X-Remote-Group: system:masters, authorization.kcp.io/warrant, authentication.kcp.io/scopes, or a group used for per-workspace required-group gating, and the shard trusts these values as authenticated identity assertions. This allows cross-workspace impersonation, authorization bypass, and arbitrary reading, writing, or deletion of resources, secrets, RBAC data, APIExports, APIBindings, and LogicalClusters. This issue is fixed in versions 0.31.4 and 0.32.2."}], "id": "CVE-2026-61682", "lastModified": "2026-09-18T16:17:07.523", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 6.0, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-18T16:17:07.523", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27ca"}, {"source": "security-advisories@github.com", "url": "https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeff"}, {"source": "security-advisories@github.com", "url": "https://github.com/kcp-dev/kcp/releases/tag/v0.31.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/kcp-dev/kcp/releases/tag/v0.32.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}, {"lang": "en", "value": "CWE-302"}, {"lang": "en", "value": "CWE-348"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}