CVE-2026-85115 Information disclosure in .NET Client Library for SIMATIC S7 Webserver API
An attacker with log access can obtain plaintext PLC restore passwords from error messages, enabling unauthorized PLC operations.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85115?
CVE-2026-85115 is a medium-severity vulnerability in Siemens .NET Client Library for SIMATIC S7 Webserver API, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.62). Affected applications do not properly redact PLC restore passwords from HTTP error exception messages. This could allow an attacker with access to logs or other diagnostic output to obtain the plaintext restore password and potentially perform unauthorized operations on the PLC.
Weakness: CWE-209
Which versions are affected by CVE-2026-85115?
How do I fix CVE-2026-85115?
No fix has been published for CVE-2026-85115 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-85115 being exploited?
There is no known exploitation of CVE-2026-85115 in the wild and no public exploit code.