SEPTEMBER 15, 2026
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Case File

CVE-2026-90898

CRITICAL · CVSS 9.8 Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-14 · Last synced 2026-09-15

CyberRota Analysis

AI-Generated

Bifrost's management API is vulnerable, allowing unauthenticated users to register MCP clients, which can execute arbitrary commands as the Bifrost process user. This critical flaw, particularly in version 2.0.0, poses a significant risk as it enables attackers to gain local admin privileges without any authentication. Organizations using affected versions should prioritize immediate remediation to prevent potential exploitation.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-90898
Severity
CRITICAL
CVSS
9.8
EPSS
N/A

Original NVD 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.