CVE-2026-76873 Netcore NR255-V 1.5.130703 Stored Cross-Site Scripting via DHCP and ARP Hostname Fields
A LAN-based attacker can inject malicious scripts via DHCP and ARP hostname fields, leading to stored XSS in the router's web interface.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-76873?
CVE-2026-76873 is a medium-severity cross-site scripting vulnerability in Netcore NR255-V, published on 15 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Netcore NR255-V version 1.5.130703 contains a stored cross-site scripting vulnerability in the DHCP dynamic IP display and ARP bind list display components handling hostname fields. A LAN-based attacker can inject malicious script through these hostname fields, which is later rendered by network_config.js and network_security.js in the web management interface.
Weakness: CWE-79
Which versions are affected by CVE-2026-76873?
How do I fix CVE-2026-76873?
No fix has been published for CVE-2026-76873 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-2026-76873 being exploited?
There is no known exploitation of CVE-2026-76873 in the wild and no public exploit code.
Sources
Also known as GHSA-2fvm-cppx-f9c5.