# CVE-2025-65289: A stored Cross site scripting (XSS) vulnerability in the Mercury MR816v2 (081C3114 4.8.7 Build 110427 Rel 36550n)…

Source: https://junglewise.ai/threats/cve-2025-65289-a-stored-cross-site-scripting-xss-vulnerability-in-the-mercury  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-09  
License: CC BY 4.0 with a link back

CVE-2025-65289 · Severity: medium · CVSS 6.1 · Published 2025-12-09

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.

Vendors: [Mercurycom](https://junglewise.ai/threats/vendors/mercurycom).

## Quick answers

**Is CVE-2025-65289 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-65289 being exploited in the wild.

**How severe is CVE-2025-65289?** Medium severity, with a CVSS score of 6.1, published 9 December 2025.

**Which products and versions are affected?** Mercurycom Mr816, Mercurycom Mr816 Firmware. The advisory does not name versions.

**Is there a fix for CVE-2025-65289?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-65289?** Check whether you run Mercurycom Mr816 or Mercurycom Mr816 Firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Mercurycom Mr816
- Mercurycom Mr816 Firmware

## Related threats

- [A buffer overflow in the Mercury MR816v2 (081C3114 4.8.7 Build 110427 Rel 36550n) occurs when the device accepts and…](https://junglewise.ai/threats/cve-2025-65288-a-buffer-overflow-in-the-mercury-mr816v2-081c3114-4-8-7-build)