CVE-2025-62842 in HBS 3 Hybrid Backup Sync
Summary
by MITRE • 01/02/2026
An external control of file name or path vulnerability has been reported to affect HBS 3 Hybrid Backup Sync. If an attacker gains local network access, they can then exploit the vulnerability to read or modify files or directories.
We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 26.2.0.938 and later
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Analysis
by VulDB Data Team • 02/06/2026
The vulnerability identified as CVE-2025-62842 represents a critical external control of file name or path issue within HBS 3 Hybrid Backup Sync software, classified under CWE-73 as "External Control of File Name or Path". This flaw enables attackers with local network access to manipulate file paths and potentially execute unauthorized read or write operations on system files and directories. The vulnerability stems from insufficient validation of user-supplied input that influences file system operations, creating an attack surface where malicious actors can craft specific inputs to traverse file system boundaries and access sensitive data. The flaw particularly affects backup synchronization processes where file paths are dynamically constructed based on user or network input without proper sanitization or validation mechanisms.
The technical exploitation of this vulnerability occurs when an attacker with local network access can manipulate input parameters that control file path resolution within the backup synchronization process. This allows for path traversal attacks where the attacker can navigate beyond intended directories and access restricted file systems or modify critical backup files. The vulnerability impacts the integrity and confidentiality of backup operations, potentially enabling data exfiltration or modification of backup data that could compromise the entire backup infrastructure. Attackers could leverage this weakness to read sensitive configuration files, access backup archives containing confidential information, or modify backup processes to redirect data to unauthorized locations.
The operational impact of CVE-2025-62842 extends beyond simple data access violations and can severely compromise backup and recovery operations within affected environments. Organizations utilizing HBS 3 Hybrid Backup Sync may experience unauthorized data access, potential data corruption, or complete backup system compromise if attackers successfully exploit this vulnerability. The attack vector requiring only local network access makes this vulnerability particularly dangerous as it does not require physical access to systems or elevated privileges, allowing attackers to target backup infrastructure from remote locations. This vulnerability directly impacts the principle of least privilege and can lead to cascading security failures in backup environments where sensitive data is stored and managed.
Organizations should immediately upgrade to HBS 3 Hybrid Backup Sync version 26.2.0.938 or later to remediate this vulnerability, as specified in the vendor's security advisory. The fix implemented in this version addresses the root cause by introducing proper input validation and sanitization mechanisms for file path construction. Security teams should also conduct comprehensive network assessments to identify any potential exploitation attempts and implement network monitoring solutions to detect suspicious file access patterns. Additional mitigations include implementing network segmentation to limit access to backup infrastructure, enforcing strict access controls on backup systems, and regularly reviewing backup logs for unauthorized file access attempts. This vulnerability aligns with ATT&CK technique T1074.001 for data staging and T1566.001 for spearphishing attachments, as attackers may leverage compromised backup systems to access sensitive data or deploy additional malicious payloads through compromised backup processes.