CVE-2026-76858 Netcore NR255-V 1.5.130703 Stored Cross-Site Scripting via DDNS eval() in ddns_wan_list_show.cgi
Attackers can inject persistent scripts via DDNS configuration in Netcore NR255-V routers, leading to code execution when the page is viewed.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-76858?
CVE-2026-76858 is a medium-severity cross-site scripting vulnerability in Netcore NR255-V, published on 15 Sep 2026. An attacker needs administrator access to exploit it, 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 ddns_wan_list_show.cgi caused by unsafe eval() handling of DDNS data. Attackers can inject malicious script through the DDNS configuration path, leading to persistent execution when the affected page is viewed.
Weakness: CWE-79
Which versions are affected by CVE-2026-76858?
How do I fix CVE-2026-76858?
No fix has been published for CVE-2026-76858 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-2026-76858 being exploited?
There is no known exploitation of CVE-2026-76858 in the wild and no public exploit code.
Sources
Also known as GHSA-wjhw-7xcr-gr58.