# 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.

- **Severity:** Medium 6.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Oct 2026
- **Updated:** 14 Oct 2026

## 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 (Generation of Error Message Containing Sensitive Information)

## 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85115 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-85115 in the wild and no public exploit code.

Affected product: Siemens .NET Client Library for SIMATIC S7 Webserver API. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-85115/ (Markdown: https://insights.sbomify.com/CVE-2026-85115/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85115
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85115
- OSV: https://osv.dev/vulnerability/CVE-2026-85115

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-85115/
Summaries are generated and may contain mistakes; the official description above is the record.