Critical Privilege Escalation Flaw in IDrive Cloud Backup Client Exposes Windows Systems to Full Compromise
A newly disclosed vulnerability in the IDrive Cloud Backup Client for Windows, tracked as CVE-2026-1995, allows local attackers to escalate privileges to NT AUTHORITY\SYSTEM, granting full control over affected systems. The flaw affects the widely used cloud backup solution’s Windows client, including both desktop and server editions, which manage encrypted data storage and synchronization across devices.
The vulnerability stems from improper file permission handling in the id_service.exe background service, which runs with SYSTEM-level privileges. The service reads files from the C:\ProgramData\IDrive directory, using their UTF-16LE encoded contents as process execution arguments. However, weak access controls permit non-privileged users to write to this directory, enabling attackers to place or modify files that trigger arbitrary code execution under SYSTEM privileges.
Exploitation requires only authenticated local access, a condition often achieved through phishing, credential theft, or insider threats. Successful attacks could allow threat actors to access sensitive backup data, disable security tools, deploy malware or ransomware, and move laterally within enterprise networks. The flaw is particularly severe due to its low complexity and high impact, posing a significant risk to organizations relying on IDrive for Windows.
At the time of disclosure, no official patch has been released, though IDrive has acknowledged the issue and is developing a fix. Until a patch is available, administrators are urged to restrict write permissions on the vulnerable directory and deploy Endpoint Detection and Response (EDR) solutions to monitor suspicious activity. Additional mitigations include enforcing Group Policy controls to block unauthorized script execution.
The vulnerability underscores the critical need for timely patching and access control hardening in third-party backup solutions, especially those operating with elevated privileges.
Source: https://cyberpress.org/idrive-for-windows-vulnerability/
IDrive Inc. cybersecurity rating report: https://www.rankiteo.com/company/idrive
"id": "IDR1774520631",
"linkid": "idrive",
"type": "Vulnerability",
"date": "3/2026",
"severity": "100",
"impact": "5",
"explanation": "Attack threatening the organization's existence"{'affected_entities': [{'customers_affected': 'Organizations relying on IDrive '
'for Windows',
'industry': 'Cloud Backup and Storage',
'name': 'IDrive',
'type': 'Company'}],
'attack_vector': 'Local',
'data_breach': {'data_encryption': 'Yes (managed by IDrive)',
'sensitivity_of_data': 'High (encrypted data storage and '
'synchronization)',
'type_of_data_compromised': 'Backup data'},
'description': 'A newly disclosed vulnerability in the IDrive Cloud Backup '
'Client for Windows, tracked as CVE-2026-1995, allows local '
'attackers to escalate privileges to NT AUTHORITY\\SYSTEM, '
'granting full control over affected systems. The flaw affects '
'the widely used cloud backup solution’s Windows client, '
'including both desktop and server editions, which manage '
'encrypted data storage and synchronization across devices. '
'The vulnerability stems from improper file permission '
'handling in the id_service.exe background service, enabling '
'arbitrary code execution under SYSTEM privileges. '
'Exploitation requires authenticated local access, often '
'achieved through phishing, credential theft, or insider '
'threats. Successful attacks could allow threat actors to '
'access sensitive backup data, disable security tools, deploy '
'malware or ransomware, and move laterally within enterprise '
'networks.',
'impact': {'data_compromised': 'Sensitive backup data',
'operational_impact': 'Disabling security tools, lateral movement '
'within networks',
'systems_affected': 'Windows systems running IDrive Cloud Backup '
'Client (desktop and server editions)'},
'lessons_learned': 'Critical need for timely patching and access control '
'hardening in third-party backup solutions operating with '
'elevated privileges',
'post_incident_analysis': {'corrective_actions': 'Develop and release an '
'official patch, enforce '
'stricter access controls',
'root_causes': 'Improper file permission handling '
'in id_service.exe background '
'service'},
'recommendations': 'Restrict write permissions on the vulnerable directory, '
'deploy EDR solutions, enforce Group Policy controls to '
'block unauthorized script execution, and monitor '
'suspicious activity',
'references': [{'source': 'Vulnerability Disclosure'}],
'response': {'containment_measures': 'Restrict write permissions on the '
'vulnerable directory '
'(C:\\ProgramData\\IDrive)',
'enhanced_monitoring': 'Monitor suspicious activity',
'remediation_measures': 'Deploy Endpoint Detection and Response '
'(EDR) solutions, enforce Group Policy '
'controls to block unauthorized script '
'execution'},
'title': 'Critical Privilege Escalation Flaw in IDrive Cloud Backup Client '
'Exposes Windows Systems to Full Compromise',
'type': 'Privilege Escalation',
'vulnerability_exploited': 'CVE-2026-1995 (Improper file permission handling '
'in id_service.exe)'}