CVE-2026-108140
Received Received - Intake

Authenticated File Write via Relative Path Traversal in NAS Backup Server

Publication date: 2026-10-27

Last updated on: 2026-10-27

Assigner: HackerOne

Description
A vulnerability allowing an authenticated user with the Restore Operator role, who also controls the contents of a backed-up NAS share, to write attacker-controlled files to an arbitrary path on the backup server through relative path traversal.

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Meta Information

Published
2026-10-27
Last Modified
2026-10-27
Generated
2026-10-27
AI Q&A
2026-10-27
EPSS Evaluated
N/A
NVD
CVE-2026-108140
EUVD
EUVD-2026-111124

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
Veeam Backup and Replication 13.0
Veeam Backup and Replication 13.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

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Executive Summary

This vulnerability allows an authenticated user with the Restore Operator role to exploit relative path traversal if they control the contents of a backed-up NAS share. This enables them to write attacker-controlled files to any path on the backup server.

Impact Analysis

An attacker could overwrite critical system files, install malware, or gain elevated privileges on the backup server. This could lead to data breaches, service disruption, or complete system compromise.

Compliance Impact

This vulnerability could lead to unauthorized access or modification of sensitive data, violating GDPR's integrity and confidentiality principles or HIPAA's security requirements. Non-compliance may result in legal penalties and reputational damage.

Mitigation Strategies

Restrict the Restore Operator role to only trusted users and ensure backed-up NAS share contents are not controlled by untrusted parties. Review and remove unnecessary file write permissions on the backup server.

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