https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-05T16:14:37.970447+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/cve-2026-90898 CVE-2026-90898 — Bifrost unauthenticated remote code execution via MCP stdio client registration 2026-10-05T16:14:37.986072+00:00

Affected: maximhq Bifrost

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.