CVE-2026-85114 Path traversal in .NET Client Library for SIMATIC S7 Webserver API
Attackers can write arbitrary files outside the intended directory via manipulated ticket responses, potentially overwriting existing files.
- 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-2026-85114?
CVE-2026-85114 is a high-severity path traversal vulnerability in Siemens .NET Client Library for SIMATIC S7 Webserver API, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.61). Affected applications do not properly validate filenames received from remote servers during ticket downloads. This could allow an attacker who can manipulate the ticket response to write arbitrary files outside the intended download directory and, when overwriting is enabled, replace existing files accessible to the application.
Weakness: CWE-22
Which versions are affected by CVE-2026-85114?
How do I fix CVE-2026-85114?
No fix has been published for CVE-2026-85114 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-2026-85114 being exploited?
There is no known exploitation of CVE-2026-85114 in the wild and no public exploit code.