# CVE-2025-6235: ExtremeControl (NAC) 'onmouseover' XSS

> An attacker can inject malicious scripts into the ExtremeControl login interface, potentially stealing user data or performing unauthorized actions in the victim's browser.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 21 Jul 2025
- **Updated:** 21 Jul 2025
- **Also known as:** GHSA-7x23-63hm-q73v

## What is CVE-2025-6235?

CVE-2025-6235 is a medium-severity cross-site scripting vulnerability in ExtremeControl, published on 21 Jul 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

In ExtremeControl before 25.5.12, a cross-site scripting (XSS) vulnerability was discovered in a login interface of the affected application. The issue stems from improper handling of user-supplied input within HTML attributes, allowing an attacker to inject script code that may execute in a user's browser under specific interaction conditions. Successful exploitation could lead to exposure of user data or unauthorized actions within the browser context.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2025-6235?

It affects 1 product.


Products: Extremenetworks Extremecontrol.

## How do I fix CVE-2025-6235?

No fix has been published for CVE-2025-6235 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-6235 being exploited?

There is no known exploitation of CVE-2025-6235 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-6235 and fix it if it is affected.

What it is: CVE-2025-6235 is a medium-severity cross-site scripting vulnerability in ExtremeControl, published on 21 Jul 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-6235 in the wild and no public exploit code.

Affected product: ExtremeControl. 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-2025-6235/ (Markdown: https://insights.sbomify.com/CVE-2025-6235/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-6235
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-6235
- OSV: https://osv.dev/vulnerability/CVE-2025-6235

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-6235/
Summaries are generated and may contain mistakes; the official description above is the record.