---
id: "CVE-2026-108140"
kind: "vulnerability"
aliases: ["CVE-2026-108140"]
title: "Backup server: restore role can write files outside target path"
severity: "medium"
cvss: 5.9
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["backup-server", "infrastructure", "nas", "restore-operator"]
not_affected_if: ["no-restore-operator-role"]
published_at: "2026-10-27T17:16:57+00:00"
first_seen_at: "2026-10-27T17:32:45+00:00"
updated_at: "2026-10-27T17:34:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-108140", "first_seen_at": "2026-10-27T17:32:45+00:00"}]
---

# Backup server: restore role can write files outside target path

An authenticated user with the Restore Operator role who also controls the contents of a backed-up NAS share can use relative path traversal to write attacker-controlled files to an arbitrary path on the backup server. The sources do not name the product, so the exact impact beyond arbitrary file write is unknown.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-27T17:32:45+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-108140

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_