Is CVE-2026-76867 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-76867 being exploited in the wild.

How severe is CVE-2026-76867?

Medium severity, with a CVSS score of 5.4, published 15 September 2026.

Is there a fix for CVE-2026-76867?

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.

How is CVE-2026-76867 attacked?

It is attacked over the network.

Am I affected by CVE-2026-76867?

Check whether you run Netcore NR255-V at an affected version. 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.

CVE-2026-76867: Netcore NR255-V stored XSS in routing and NAT configuration

CVE-2026-76867 · Severity: medium · CVSS 5.4 · Published 2026-09-15

The Netcore NR255-V is a wireless router used to provide network connectivity and manage traffic routing in homes and small businesses. This vulnerability allows an attacker with administrative access to inject malicious scripts into the router's routing and NAT configuration pages. When other administrators view these pages, the injected scripts execute in their browser, potentially allowing credential theft, session hijacking, or unauthorized configuration changes.

Technologies: Netcore NR255-V. Vendors: Netcore.

Quick answers

Is CVE-2026-76867 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-76867 being exploited in the wild.
How severe is CVE-2026-76867?: Medium severity, with a CVSS score of 5.4, published 15 September 2026.
Which products and versions are affected?: Netcore NR255-V 1.5.130703.
Is there a fix for CVE-2026-76867?: 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.
How is CVE-2026-76867 attacked?: It is attacked over the network.
Am I affected by CVE-2026-76867?: Check whether you run Netcore NR255-V at an affected version. 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.

Technical details

This is a stored cross-site scripting (XSS) vulnerability (CWE-79) affecting multiple CGI components: routing_tab_add_cgi, routing_table_list_show_cgi, route_policy_add_cgi, and route_policy_parame_show_cgi. The root cause is improper input neutralization in these components, which use eval() and HTML sinks without proper sanitization. An authenticated attacker can inject persistent malicious script payloads through route and NAT configuration pages; these payloads are stored and executed when other administrators view the affected pages. The vulnerability requires authentication and user interaction (viewing the configuration page), but the stored nature makes it particularly dangerous in multi-user administrative environments. Patches should be available from Netcore for firmware versions after 1.5.130703.

Affected products

Netcore NR255-V 1.5.130703

Timeline

2026-09-04: disclosed
2026-09-15: advisory

References

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