Lenovo Personal Cloud Storage Improper File Path Validation Vulnerability (CVE-2026-6282)

A potential improper file path validation vulnerability, identified as CVE-2026-6282, has been reported in some Lenovo Personal Cloud Storage devices. This vulnerability could allow a remote authenticated user to move or access files belonging to other users on the same device. The vulnerability stems from a failure to properly validate file paths, potentially leading to path traversal. This issue allows an attacker with valid credentials to elevate their privileges and access sensitive information stored on the device outside of their designated file paths. Defenders need to ensure that Lenovo Personal Cloud Storage devices are properly secured and monitored for unauthorized file access attempts.

Attack Chain

1. The attacker gains valid credentials to a Lenovo Personal Cloud Storage device through existing account compromise.
2. The attacker authenticates to the Lenovo Personal Cloud Storage device via the web interface or API.
3. The attacker crafts a malicious request to move or access a file, including a path traversal sequence (e.g., “../”) in the file path parameter.
4. The Lenovo Personal Cloud Storage device improperly validates the file path, failing to restrict access to authorized directories.
5. The attacker successfully moves or accesses a file or directory outside of their authorized scope.
6. The attacker reads sensitive files belonging to other users, such as documents, photos, or configuration files.
7. The attacker modifies or deletes files belonging to other users, leading to data corruption or denial of service.
8. The attacker exfiltrates the stolen data.

Impact

Successful exploitation of CVE-2026-6282 could allow an attacker with valid user credentials to access and manipulate files belonging to other users on the affected Lenovo Personal Cloud Storage device. This could lead to unauthorized access to sensitive information, data breaches, data corruption, or denial of service. The CVSS v3.1 base score for this vulnerability is 8.1, indicating a high severity.

Recommendation

• Apply available patches or mitigations released by Lenovo to address CVE-2026-6282 on affected Personal Cloud Storage devices, as referenced in the Lenovo advisory URLs.
• Monitor web server logs for suspicious requests containing path traversal sequences (e.g., “../”) targeting file access endpoints using the Sigma rule provided below.
• Implement strict input validation and sanitization on file path parameters within the Lenovo Personal Cloud Storage application to prevent path traversal vulnerabilities (CWE-22).