CVE WatchSep 14, 2026

CVE-2026-90898

Bifrost registers MCP clients through its management API. A stdio client is a command plus args. Bifrost starts that program in the gateway

CVSS

9.8

Critical

EPSS

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KEV

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Exploit Today

0-100

Published: Sep 14, 2026 · Last modified: Sep 14, 2026 · CWE-284 · CWE-306

EPSS · 30d

Not enough EPSS history yet.

Technical 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. 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.

Official references

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