EUVD-2026-65692
GHSA-cmwv-wf9p-p8wx
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network DNS rebinding requires passive victim browser interaction (UI:R); no attacker privileges needed; scope changes to GenieACS NBI (S:C); device reboots justify A:L on subsequent systems.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
DNS rebinding in genieacs-mcp's Streamable HTTP transport (versions <= 0.3.1) allows a malicious website to route browser requests through loopback to the unauthenticated /mcp listener and invoke arbitrary GenieACS NBI operations against managed CPE devices. Affected deployments expose full read/write access to TR-069 device state - including firmware update tasks, parameter changes, device reboots, presets, and connection requests - to any attacker who can lure the server operator to a malicious web page. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: (1) genieacs-mcp must be running the Go binary with HTTP transport active - this is the default when TRANSPORT is not set to 'stdio'; (2) MCP_AUTH_TOKEN must be unset, which the README explicitly documents as acceptable for loopback deployments; and (3) the operator must visit a malicious web page in a browser on the same host while the server is running. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.8 reflects genuine severity: AV:N, PR:N, and SC:H/SI:H capture that an unauthenticated network attacker can achieve high-integrity impact on the subsequent GenieACS NBI and managed CPE estate. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: v0.3.2, available at https://github.com/GeiserX/genieacs-mcp/releases/tag/v0.3.2. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all genieacs-mcp deployments and identify systems running version 0.3.1 or earlier; immediately restrict HTTP listener access to trusted networks only via firewall ACLs and disable Streamable HTTP transport if alternative protocols (HTTPS, gRPC) are available. …
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Same weakness CWE-346 – Origin Validation Error
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