{"id":"CVE-2025-58444","aliases":["EUVD-2025-27271","GHSA-g9hg-qhmf-q45m"],"status":"published","title":"MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server","description":"The MCP inspector is a developer tool for testing and debugging MCP servers. A cross-site scripting issue was reported in versions of the MCP Inspector local development tool prior to 0.16.6 when connecting to untrusted remote MCP servers with a malicious redirect URI. This could be leveraged to interact directly with the inspector proxy to trigger arbitrary command execution. Users are advised to update to 0.16.6 to resolve this issue.","severity":{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00705,"percentile":0.53784,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79","CWE-84","CWE-94"],"published":"2025-09-08T21:14:23Z","modified":"2026-11-11T02:47:54Z","fixes":[{"ecosystem":"npm","package":"@modelcontextprotocol/inspector","fixed_in":["0.16.6"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@modelcontextprotocol/inspector","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.16.6"}]}]},{"source":"osv","ecosystem":"npm","package":"@modelcontextprotocol/inspector","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.16.6"}]}]}],"products":[{"vendor":"mcpjam","product":"inspector"},{"vendor":"modelcontextprotocol","product":"inspector"}],"references":[{"url":"https://github.com/modelcontextprotocol/inspector/security/advisories/GHSA-g9hg-qhmf-q45m","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/modelcontextprotocol/inspector/commit/650f3090d26344a672026b737d81586595bb1f60","tags":["x_refsource_MISC","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-58444","tags":["advisory"]},{"url":"https://www.npmjs.com/package/@modelcontextprotocol/inspector/v/0.16.6","tags":["web"]},{"url":"https://github.com/advisories/GHSA-g9hg-qhmf-q45m"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/58xxx/CVE-2025-58444.json","tags":["advisory"]},{"url":"https://github.com/modelcontextprotocol/inspector","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-58444","title":"MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server","description":"The MCP inspector is a developer tool for testing and debugging MCP servers. A cross-site scripting issue was reported in versions of the MCP Inspector local development tool prior to 0.16.6 when connecting to untrusted remote MCP servers with a malicious redirect URI. This could be leveraged to interact directly with the inspector proxy to trigger arbitrary command execution. Users are advised to update to 0.16.6 to resolve this issue.","status":"published","published":"2025-09-08T21:24:58.821Z","modified":"2025-09-09T13:31:04.737Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-84"],"updated_at":"2026-11-02T14:32:37.351404Z"}],"euvd":[{"id":"EUVD-2025-27271","description":"The MCP inspector is a developer tool for testing and debugging MCP servers. A cross-site scripting issue was reported in versions of the MCP Inspector local development tool prior to 0.16.6 when connecting to untrusted remote MCP servers with a malicious redirect URI. This could be leveraged to interact directly with the inspector proxy to trigger arbitrary command execution. Users are advised to update to 0.16.6 to resolve this issue.","status":"published","published":"2025-09-08T21:24:58Z","modified":"2025-09-09T13:31:04Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T20:31:46.000077Z"}],"ghsa":[{"id":"GHSA-g9hg-qhmf-q45m","title":"MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server","description":"An XSS flaw exists in the MCP Inspector local development tool when it renders a redirect URL returned by a remote MCP server. If the Inspector connects to an untrusted server, a crafted redirect can inject script into the Inspector context and, via the built-in proxy, be leveraged to trigger arbitrary command execution on the developer machine. Version 0.16.6 hardens URL handling/validation and prevents script execution.\n\n\u003e Thank you to the following researchers for their reports and contributions:\n\u003e * Raymond (Veria Labs)\n\u003e * Gavin Zhong, \u003csuperboyzjc@gmail.com\u003e \u0026 Shuyang Wang, \u003cswang@obsidiansecurity.com\u003e.","status":"published","published":"2025-09-08T21:14:23Z","modified":"2025-09-26T17:07:03Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-79","CWE-84","CWE-94"],"updated_at":"2026-11-02T14:38:58.965005Z"}],"nvd":[{"id":"CVE-2025-58444","description":"The MCP inspector is a developer tool for testing and debugging MCP servers. A cross-site scripting issue was reported in versions of the MCP Inspector local development tool prior to 0.16.6 when connecting to untrusted remote MCP servers with a malicious redirect URI. This could be leveraged to interact directly with the inspector proxy to trigger arbitrary command execution. Users are advised to update to 0.16.6 to resolve this issue.","status":"published","published":"2025-09-08T22:15:34.247Z","modified":"2026-06-17T09:44:28.127Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/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","level":"high","assessor":"secondary"}],"cwes":["CWE-84"],"updated_at":"2026-11-02T14:11:27.73916Z"}],"osv":[{"id":"CVE-2025-58444","title":"MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server","description":"The MCP inspector is a developer tool for testing and debugging MCP servers. A cross-site scripting issue was reported in versions of the MCP Inspector local development tool prior to 0.16.6 when connecting to untrusted remote MCP servers with a malicious redirect URI. This could be leveraged to interact directly with the inspector proxy to trigger arbitrary command execution. Users are advised to update to 0.16.6 to resolve this issue.","status":"published","published":"2025-09-08T21:24:58.821Z","modified":"2026-11-11T10:47:21.746287523Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-84"],"updated_at":"2026-11-11T03:22:28.447808Z"},{"id":"GHSA-g9hg-qhmf-q45m","title":"MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server","description":"An XSS flaw exists in the MCP Inspector local development tool when it renders a redirect URL returned by a remote MCP server. If the Inspector connects to an untrusted server, a crafted redirect can inject script into the Inspector context and, via the built-in proxy, be leveraged to trigger arbitrary command execution on the developer machine. Version 0.16.6 hardens URL handling/validation and prevents script execution.\n\n\u003e Thank you to the following researchers for their reports and contributions:\n\u003e * Raymond (Veria Labs)\n\u003e * Gavin Zhong, \u003csuperboyzjc@gmail.com\u003e \u0026 Shuyang Wang, \u003cswang@obsidiansecurity.com\u003e.","status":"published","published":"2025-09-08T21:14:23Z","modified":"2025-09-26T17:07:01Z","cvss":[{"version":"4.0","score":8.6,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-79","CWE-84","CWE-94"],"updated_at":"2026-11-02T15:46:47.472172Z"}]}}