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.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
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
Which versions are affected by CVE-2025-65289?
It affects 1 product.
Products include 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.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
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
Sources
Also known as GHSA-m239-qhfc-2cv2.