# CVE-2025-40806: Information disclosure in Gridscale X Prepay

> Unauthenticated attackers can enumerate valid users via distinguishable responses, facilitating targeted brute-force attacks against Gridscale X Prepay.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Dec 2025
- **Updated:** 9 Dec 2025
- **Also known as:** GHSA-38mg-mw32-j4p4

## What is CVE-2025-40806?

CVE-2025-40806 is a medium-severity vulnerability in Siemens Gridscale X Prepay, published on 9 Dec 2025. 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 Gridscale X Prepay (All versions < V4.2.1). The affected application is vulnerable to user enumeration due to distinguishable responses. This could allow an unauthenticated remote attacker to determine if a user is valid or not, enabling a brute force attack with valid users.

Weakness: CWE-204 (Observable Response Discrepancy)

## Which versions are affected by CVE-2025-40806?

It affects 1 product.


Products: Siemens Gridscale X Prepay.

## How do I fix CVE-2025-40806?

No fix has been published for CVE-2025-40806 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-40806 being exploited?

There is no known exploitation of CVE-2025-40806 in the wild and no public exploit code.

## Other vulnerabilities in Siemens Gridscale X Prepay

- [CVE-2025-40807](https://insights.sbomify.com/CVE-2025-40807/): Auth bypass in Gridscale X Prepay (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40806 and fix it if it is affected.

What it is: CVE-2025-40806 is a medium-severity vulnerability in Siemens Gridscale X Prepay, published on 9 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-40806 in the wild and no public exploit code.

Affected product: Siemens Gridscale X Prepay. 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-2025-40806/ (Markdown: https://insights.sbomify.com/CVE-2025-40806/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40806
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40806
- OSV: https://osv.dev/vulnerability/CVE-2025-40806

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40806/
Summaries are generated and may contain mistakes; the official description above is the record.