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Critical severity9.8NVD Advisory· Published Sep 14, 2026· Updated Sep 14, 2026

CVE-2026-90898

CVE-2026-90898

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.

AI Insight

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Affected products

2
  • Maximhq/Bifrostreferences2 versions
    (expand)+ 1 more
    • (no CPE)
    • (no CPE)range: <=transports/v2.0.0

Patches

Vulnerability mechanics

References

3

News mentions

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