# CVE-2025-10640: Missing Server-Side Authentication Checks in EfficientLab WorkExaminer Professional

> Unauthenticated attackers can bypass login checks to gain administrative access and view sensitive user monitoring data.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Oct 2025
- **Updated:** 3 Nov 2025
- **Also known as:** GHSA-8xf9-xq28-hpj9

## What is CVE-2025-10640?

CVE-2025-10640 is a critical authentication bypass vulnerability in EfficientLab WorkExaminer Professional, published on 21 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An unauthenticated attacker with access to TCP port 12306 of the WorkExaminer server can exploit missing server-side authentication checks to bypass the login prompt in the WorkExaminer Professional console to gain administrative access to the WorkExaminer server and therefore all sensitive monitoring data. This includes monitored screenshots and keystrokes of all users.

The WorkExaminer Professional console is used for administrative access to the server. Before access to the console is granted administrators must login. Internally, a custom protocol is used to call a respective stored procedure on the MSSQL database. The return value of the call is not validated on the server-side. Instead it is only validated client-side which allows to bypass authentication.

Weakness: CWE-602 (Client-Side Enforcement of Server-Side Security)

## Which versions are affected by CVE-2025-10640?


## How do I fix CVE-2025-10640?

No fix has been published for CVE-2025-10640 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-10640 being exploited?

There is no known exploitation of CVE-2025-10640 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-10640 and fix it if it is affected.

What it is: CVE-2025-10640 is a critical authentication bypass vulnerability in EfficientLab WorkExaminer Professional, published on 21 Oct 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-2025-10640 in the wild and no public exploit code.

Affected product: EfficientLab WorkExaminer Professional. 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-2025-10640/ (Markdown: https://insights.sbomify.com/CVE-2025-10640/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-10640
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-10640
- OSV: https://osv.dev/vulnerability/CVE-2025-10640

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-10640/
Summaries are generated and may contain mistakes; the official description above is the record.