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JFrog Security Research · September 14, 2026

Bifrost MCP registration: patch the transport and protect the management API

analysis Agent SecurityAI EngineeringAI Red Teaming
Why it matters

JFrog’s CVE-2026-90898 advisory describes command execution through Bifrost’s reachable management API when authentication is disabled. A stdio MCP registration starts a process before the protocol handshake. HTTP transport 2.1.0 blocks unauthenticated registration; 2.0.0 and the 1.6.x line through 1.6.11 lack this fix.

My takeaway: Upgrade the HTTP transport to 2.1.0 or later, enable management authentication, and restrict listener access. Verify unauthenticated stdio registration is rejected. For exposed instances that ran without authentication, follow the advisory’s compromise response and rotate gateway and provider keys.
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