CVE-2023-27856 Rockwell Automation ThinManager ThinServer Path Traversal Download

High 7.5 Published 21 Mar 2023 Updated 25 Feb 2025

An unauthenticated remote attacker can exploit a path traversal vulnerability in Rockwell Automation ThinManager ThinServer to download arbitrary files from the server.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-27856?

CVE-2023-27856 is a high-severity path traversal vulnerability in Rockwell Automation ThinManager ThinServer, published on 21 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In affected versions, path traversal exists when processing a message of type 8

in Rockwell Automation's ThinManager ThinServer.

An unauthenticated remote attacker can exploit this vulnerability to download arbitrary files on the disk drive where ThinServer.exe is installed.

Weakness: CWE-22

Which versions are affected by CVE-2023-27856?

It affects 1 product.

Products include Rockwellautomation Thinmanager.

How do I fix CVE-2023-27856?

No fix has been published for CVE-2023-27856 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2023-27856 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-27856 exists.

Public exploit code: 1 Metasploit module.

Sources

Also known as GHSA-9hjj-m2fc-f62r.