---
id: "CVE-2026-43852"
kind: "vulnerability"
aliases: ["CVE-2026-43852"]
title: "Authenticated attacker can write files to arbitrary system locations"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "ADAM-3600", "fixed": ["2.8.5.0"], "affected": "< 2.8.5.0", "ecosystem": "vendor"}]
ecosystems: []
tags: ["adam-3600", "advantech", "edgelink", "ics", "other", "path-traversal", "rtu"]
not_affected_if: ["auth-required", "not-exposed-to-network"]
published_at: "2026-10-20T10:17:06+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-25T03:34:00+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43852", "first_seen_at": "2026-10-23T21:57:20+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-25T03:34:00+00:00"}]
---

# Authenticated attacker can write files to arbitrary system locations

Advantech ADAM-3600 EdgeLink RTU: an authenticated user can write files to arbitrary locations through a path traversal (../) in the project file download handler (mod_projectmr, message ID 101). It is one of 30 CVEs fixed in the same advisory. No exploitation or public PoC found.

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

## Affected

- vendor:ADAM-3600 affected < 2.8.5.0 fixed 2.8.5.0

## How to check

Check the ADAM-3600 firmware/EdgeLink version in the device web UI; versions prior to 2.8.5.0 are affected per CVE record and Canadian Cyber Centre AV26-1065. Also check whether the device's project-transfer service is reachable from untrusted networks.

## Fix

Update ADAM-3600 to 2.8.5.0 or later (CVE record: affected prior to 2.8.5.0). The vendor PDF's sibling item for CVE-2026-43851 says read/write directories are restricted starting from 2.8.5.1 (Standard and SE editions); the fix cell for this CVE was cut off in what I read, so prefer 2.8.5.1 or the latest and confirm in the vendor PDF.

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-43852
- 2026-10-25T03:34:00+00:00 analyst — Product identified as Advantech ADAM-3600 (EdgeLink RTU), vendor advisory ACIRT-261001 item 24 (NN-2026-0013): path traversal in CommandFileDownload::Execute, message ID 101 (Download Start). Vendor PDF text was truncated at the fix cell for this item, so exact fix version not confirmed; no verify marks.

## Documents

- [advisory] Advantech: Vulnerabilities Identified in ADAM-3600 (ACIRT-261001) https://advcloudfiles.advantech.com/cms/de8e2d94-10ab-470e-ac6f-d2e5434f4ec4/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----ADAM-3600.pdf
- [advisory] CSA Singapore AL-2026-149: Advantech ADAM-3600 EdgeLink multiple vulnerabilities https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149
- [describes] CVE Record CVE-2026-43852 https://www.cve.org/CVERecord?id=CVE-2026-43852

## From the sources

A vulnerability could allow an authenticated attacker to write files to arbitrary locations on the system.

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