Browserstack — the complete, unedited output of the deterministic mcptrustchecker engine v1.13.0, scanned . Every finding, capability tag and score component below is exactly what the engine produced — no AI, no post-processing.
{
"tool": {
"name": "mcptrustchecker",
"version": "1.13.0",
"methodologyVersion": "mcptrustchecker-1.13"
},
"target": {
"id": "@browserstack/mcp-server",
"source": {
"kind": "package",
"origin": "@browserstack/mcp-server"
},
"server": {
"name": "@browserstack/mcp-server"
}
},
"grade": "A",
"score": {
"score": 94,
"threatScore": 100,
"grade": "A",
"band": "A",
"categorySubtotals": {
"injection": 0,
"exfiltration": 0,
"permissions": 0,
"supply-chain": 0,
"network": 0,
"hygiene": 0
},
"vector": [
{
"kind": "client",
"term": "capability-exposure",
"level": "high",
"label": "capability blast radius (high) — client exposure if the model is manipulated",
"appliedPenalty": 6
},
{
"kind": "client",
"term": "verification-discount",
"level": "source",
"label": "publisher verification (provenance) — cryptographic build provenance ties the artifact to its source",
"appliedPenalty": 0
},
{
"kind": "client",
"term": "coverage-honesty",
"level": "source",
"label": "inspection depth (source) — how much of the target the scan could see",
"appliedPenalty": 0
}
],
"gatesFired": [],
"methodologyVersion": "mcptrustchecker-1.13"
},
"capability": {
"level": "high",
"reasons": [
"ingests untrusted external content (a prompt-injection entry point)",
"can send data / act on an external service",
"can execute shell commands or code"
],
"tags": [
"untrusted-input",
"external-sink",
"code-exec"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (45 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command \"npx -y <package>\"."
]
},
"findings": [
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (dist/lib/local.js)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`dist/lib/local.js:2`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "dist/lib/local.js"
},
"evidence": "port { execSync } from \"child_process\"; import { Local } from \"browserstack-local\"; import config from \"../config.js\"; a",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "dist/lib/local.js",
"line": 2,
"nonRuntime": false
}
},
{
"ruleId": "MTC-FLOW-005",
"title": "Untrusted input can drive an external action",
"category": "exfiltration",
"severity": "medium",
"confidence": "strong",
"description": "Untrusted-input tools ([fetchAccessibilityIssues, fetchAutomationScreenshots, getFailureLogs, fetchSelfHealedSelectors, getTestPlan, getSubTestPlan]) co-exist with external-action tools ([uploadProductRequirementFile]). A prompt injection could cause unwanted external actions, though no direct sensitive-data leak path was found.",
"remediation": "Require confirmation for state-changing/egress actions triggered after processing untrusted content.",
"location": {
"kind": "flow",
"name": "fetchAccessibilityIssues → uploadProductRequirementFile"
},
"evidence": "untrusted [fetchAccessibilityIssues, fetchAutomationScreenshots, getFailureLogs, fetchSelfHealedSelectors, getTestPlan, getSubTestPlan] → sinks [uploadProductRe",
"owasp": "LLM06:2025 Excessive Agency",
"references": [],
"data": {
"untrusted": [
"fetchAccessibilityIssues",
"fetchAutomationScreenshots",
"getFailureLogs",
"fetchSelfHealedSelectors",
"getTestPlan",
"getSubTestPlan"
],
"sinks": [
"uploadProductRequirementFile"
]
}
},
{
"ruleId": "MTC-SRC-003",
"title": "Hardcoded egress to an external endpoint (dist/tools/review-agent-utils/percy-approve-reject.js)",
"category": "exfiltration",
"severity": "medium",
"confidence": "strong",
"description": "In the server's implementation (`dist/tools/review-agent-utils/percy-approve-reject.js:18`): A hardcoded outbound call to a fixed external host inside server code is a classic exfiltration/telemetry channel — especially paired with reads of local data. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "dist/tools/review-agent-utils/percy-approve-reject.js"
},
"evidence": "const response = await fetch(\"https://percy.io/api/v1/reviews\", { method: \"POST\", headers: {",
"owasp": "LLM02:2025 Sensitive Information Disclosure",
"data": {
"rule": "MTC-SRC-003",
"file": "dist/tools/review-agent-utils/percy-approve-reject.js",
"line": 18,
"nonRuntime": false
}
}
],
"toxicFlows": [
{
"id": "flow-1",
"severity": "medium",
"confidence": "strong",
"untrustedInput": [
"fetchAccessibilityIssues",
"fetchAutomationScreenshots",
"getFailureLogs",
"fetchSelfHealedSelectors",
"getTestPlan",
"getSubTestPlan"
],
"sensitiveSource": [],
"externalSink": [
"uploadProductRequirementFile"
],
"selfContained": false,
"description": "Untrusted input can drive an external action even though no sensitive source is exposed."
}
],
"capabilities": [
{
"tool": "accessibilityExpert",
"tags": [],
"reasons": {}
},
{
"tool": "startAccessibilityScan",
"tags": [],
"reasons": {}
},
{
"tool": "createAccessibilityAuthConfig",
"tags": [],
"reasons": {}
},
{
"tool": "getAccessibilityAuthConfig",
"tags": [],
"reasons": {}
},
{
"tool": "fetchAccessibilityIssues",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "takeAppScreenshot",
"tags": [],
"reasons": {}
},
{
"tool": "runAppTestsOnBrowserStack",
"tags": [],
"reasons": {}
},
{
"tool": "setupBrowserStackAppAutomateTests",
"tags": [],
"reasons": {}
},
{
"tool": "runAppLiveSession",
"tags": [],
"reasons": {}
},
{
"tool": "fetchAutomationScreenshots",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "setupBrowserStackAutomateTests",
"tags": [],
"reasons": {}
},
{
"tool": "fetchBuildInsights",
"tags": [],
"reasons": {}
},
{
"tool": "getFailureLogs",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "runBrowserLiveSession",
"tags": [],
"reasons": {}
},
{
"tool": "getFailuresInLastRun",
"tags": [],
"reasons": {}
},
{
"tool": "percyVisualTestIntegrationAgent",
"tags": [],
"reasons": {}
},
{
"tool": "expandPercyVisualTesting",
"tags": [],
"reasons": {}
},
{
"tool": "addPercySnapshotCommands",
"tags": [],
"reasons": {}
},
{
"tool": "listTestFiles",
"tags": [],
"reasons": {}
},
{
"tool": "runPercyScan",
"tags": [],
"reasons": {}
},
{
"tool": "fetchPercyChanges",
"tags": [],
"reasons": {}
},
{
"tool": "managePercyBuildApproval",
"tags": [],
"reasons": {}
},
{
"tool": "fetchRCA",
"tags": [],
"reasons": {}
},
{
"tool": "getBuildId",
"tags": [],
"reasons": {}
},
{
"tool": "listBuildId",
"tags": [],
"reasons": {}
},
{
"tool": "listTestIds",
"tags": [],
"reasons": {}
},
{
"tool": "fetchSelfHealedSelectors",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "prepareSelfHealingPlan",
"tags": [],
"reasons": {}
},
{
"tool": "createProjectOrFolder",
"tags": [],
"reasons": {}
},
{
"tool": "createTestCase",
"tags": [],
"reasons": {}
},
{
"tool": "updateTestCase",
"tags": [],
"reasons": {}
},
{
"tool": "listTestCases",
"tags": [],
"reasons": {}
},
{
"tool": "listFolders",
"tags": [],
"reasons": {}
},
{
"tool": "listTestCaseTemplates",
"tags": [],
"reasons": {}
},
{
"tool": "createTestRun",
"tags": [],
"reasons": {}
},
{
"tool": "listTestRuns",
"tags": [],
"reasons": {}
},
{
"tool": "updateTestRun",
"tags": [],
"reasons": {}
},
{
"tool": "addTestResult",
"tags": [],
"reasons": {}
},
{
"tool": "uploadProductRequirementFile",
"tags": [
"external-sink"
],
"reasons": {
"external-sink": [
"keyword \"upload_file\""
]
}
},
{
"tool": "createTestCasesFromFile",
"tags": [],
"reasons": {}
},
{
"tool": "createLCASteps",
"tags": [],
"reasons": {}
},
{
"tool": "listTestPlans",
"tags": [],
"reasons": {}
},
{
"tool": "getTestPlan",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
},
{
"tool": "listSubTestPlans",
"tags": [],
"reasons": {}
},
{
"tool": "getSubTestPlan",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"fetch\""
]
}
}
],
"surfaceDigest": "ecdb2ac282e98d9b3402d457e8d546d82779a92f6dcbe5b374d1a7e66c9ce259",
"stats": {
"tools": 45,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 1,
"medium": 2,
"low": 0,
"info": 0
}
}
}