# CVE-2025-65289: Cross-site scripting in n/a

> Remote LAN attackers can inject JavaScript via malicious hostnames to steal admin sessions and perform administrative actions on Mercury MR816v2 routers.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Dec 2025
- **Updated:** 10 Dec 2025
- **Also known as:** GHSA-m239-qhfc-2cv2

## What is CVE-2025-65289?

CVE-2025-65289 is a medium-severity cross-site scripting vulnerability in n/a, published on 9 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A stored Cross site scripting (XSS) vulnerability in the Mercury MR816v2 (081C3114 4.8.7 Build 110427 Rel 36550n) router allows a remote attacker on the LAN to inject JavaScript into the router's management UI by submitting a malicious hostname. The injected script is stored and later executed in the context of an administrator's browser (for example after DHCP release/renew triggers the interface to display the stored hostname). Because the management interface uses weak/basic authentication and does not properly protect or isolate session material, the XSS can be used to exfiltrate the admin session and perform administrative actions.

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

## Which versions are affected by CVE-2025-65289?

It affects 1 product.


Products: Mercurycom Mr816 Firmware.

## How do I fix CVE-2025-65289?

No fix has been published for CVE-2025-65289 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-65289 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-65289 exists.

## Other vulnerabilities in n/a

- [CVE-2025-65288](https://insights.sbomify.com/CVE-2025-65288/): Memory corruption in n/a (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-65289 and fix it if it is affected.

What it is: CVE-2025-65289 is a medium-severity cross-site scripting vulnerability in n/a, published on 9 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-65289 exists.

Affected product: n/a. 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-2025-65289/ (Markdown: https://insights.sbomify.com/CVE-2025-65289/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-65289
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-65289
- OSV: https://osv.dev/vulnerability/CVE-2025-65289

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-65289/
Summaries are generated and may contain mistakes; the official description above is the record.