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CVE-2026-90898

Bifrost unauthenticated remote code execution via MCP stdio client registration

CVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-90898

Published

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. The 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).  transports/v2.1.0 refuses an unauthenticated stdio registration with 403. transports/v2.0.0 still allows it.

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Affected versions, risk and source history

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Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-90898 · CVE overview and exploitation status

cve-program · CVE-2026-90898

Related changes

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