CVE-2026-90898

{"id": "CVE-2026-90898", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-90898", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-09-14T11:01:44.207374Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "reefs@jfrog.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "reefs@jfrog.com", "affectedData": [{"repo": "git://github.com/maximhq/bifrost", "vendor": "maximhq", "modules": ["transports/bifrost-http", "core/mcp"], "product": "Bifrost", "versions": [{"status": "affected", "version": "0", "lessThan": "2.1.0", "versionType": "semver"}], "platforms": ["Linux", "macOS"], "packageName": "github.com/maximhq/bifrost/transports", "programFiles": ["transports/bifrost-http/handlers/mcp.go", "transports/bifrost-http/handlers/middlewares.go"], "collectionURL": "https://github.com/maximhq/bifrost", "defaultStatus": "unaffected"}]}], "published": "2026-09-14T11:17:08.237", "references": [{"url": "https://github.com/maximhq/bifrost", "source": "reefs@jfrog.com"}, {"url": "https://github.com/maximhq/bifrost/commit/12e170352bd25eab1ae9ba16611f1797d1fd8fdc", "source": "reefs@jfrog.com"}, {"url": "https://github.com/maximhq/bifrost/pull/6757", "source": "reefs@jfrog.com"}, {"url": "https://github.com/maximhq/bifrost/releases/tag/transports/v2.1.0", "source": "reefs@jfrog.com"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "reefs@jfrog.com", "description": [{"lang": "en", "value": "CWE-284"}, {"lang": "en", "value": "CWE-306"}]}], "descriptions": [{"lang": "en", "value": "Bifrost registers MCP clients through its management API. A stdio client is a command plus args. Bifrost starts that program in the gateway the moment the client is added. No MCP handshake required.\n\n\n\nThe default is governance.auth_config.is_enabled=false. Auth off means every caller is a local admin. One unauthenticated POST /api/mcp/client is enough to run a program as the Bifrost process user (appuser on the official image).\n\n\n\n\u00a0transports/v2.1.0 refuses an unauthenticated stdio registration with 403. transports/v2.0.0 still allows it."}], "lastModified": "2026-09-14T12:17:51.657", "sourceIdentifier": "reefs@jfrog.com"}