{"cvss":0.0,"datePublished":"2026-10-23T00:00:00Z","dateUpdated":"2026-10-23T00:00:00Z","description":"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 transports/v2.1.0 refuses an unauthenticated stdio registration with 403. transports/v2.0.0 still allows it.","dueDate":"","id":"CVE-2026-90898","kev_catalogs":["vulncheck"],"knownRansomwareCampaignUse":"Unknown","product":"Bifrost","requiredAction":"Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.","severity":"HIGH","source":"vulncheck_kev","title":"  Improper Access Control","vendor":"maximhq"}