---
id: CVE-2025-65289
title: >-
  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 h…
summary: >-
  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 h…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: mercurycom
product: mr816_firmware
affected:
  - mr816_firmware = 081c3114_4.8.7
published: '2025-12-09'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T13:10:00.173'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-65289'
references:
  - url: 'https://damiri.fr/en/cve/CVE-2025-65289'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00319
epssPercentile: 0.24678
ingestedAt: '2026-10-27T18:52:09.692Z'
---

## Overview

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.

## Affected

- `mr816_firmware = 081c3114_4.8.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.