Threats Tagged 'cve-2026-55637'
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Threats Tagged 'cve-2026-55637'
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CVE-2026-55637: CWE-346: Origin Validation Error in GeiserX genieacs-mcpCVE-2026-55637 0 genieacs-mcp is an MCP server for GenieACS written in Go. Prior to 0.3.2, the Streamable HTTP transport in cmd/server/main.go creates an unauthenticated /mcp listener on the default MCP_LISTEN_ADDR value 127.0.0.1:8080 when MCP_AUTH_TOKEN is unset and the httpSrv.Start(addr) branch does not validate the Host or Origin headers. A malicious website can use DNS rebinding to send browser requests with attacker-controlled Host and Origin values to the loopback listener, initialize an MCP session, list tools, and invoke operations against the GenieACS NBI configured by ACS_URL. Successful exploitation can expose or modify CPE management state, including device reboots, firmware tasks, TR-069 parameter changes, presets, provisions, tags, connection requests, and task operations. The npm wrapper is not affected because it forces TRANSPORT=stdio and does not expose an HTTP listener. This issue is fixed in version 0.3.2. Join the discussion | CVE Database V5 | 08/25/2026, 18:03:34 UTC Added: 08/25/2026, 18:22:57 UTC |
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