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