Is CVE-2026-76857 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-76857 being exploited in the wild.

How severe is CVE-2026-76857?

Medium severity, with a CVSS score of 6.5, published 15 September 2026.

Is there a fix for CVE-2026-76857?

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-2026-76857 attacked?

It is attacked over the network.

Am I affected by CVE-2026-76857?

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-2026-76857: Netcore NR255-V plaintext DDNS credential disclosure

CVE-2026-76857 · Severity: medium · CVSS 6.5 · Published 2026-09-15

The Netcore NR255-V is a wireless router used in home and small office networks. An authenticated attacker can extract plaintext DDNS account credentials from the router's web interface, leading to compromise of users' dynamic DNS accounts and potential redirection of traffic to attacker-controlled systems.

Technologies: Netcore NR255-V. Vendors: Netcore.

Quick answers

Is CVE-2026-76857 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-76857 being exploited in the wild.
How severe is CVE-2026-76857?: Medium severity, with a CVSS score of 6.5, published 15 September 2026.
Which products and versions are affected?: Netcore NR255-V 1.5.130703.
Is there a fix for CVE-2026-76857?: 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-2026-76857 attacked?: It is attacked over the network.
Am I affected by CVE-2026-76857?: 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

The vulnerability is an insufficiently protected credentials disclosure (CWE-522) in the ddns_wan_list_show.cgi endpoint and related DDNSset_cgi, IGD_GetCgiHandler, and IGD_CgiCall components. An attacker with authentication to the router's web interface can access these CGI handlers to retrieve plaintext DDNS account credentials. The attack requires network reachability to the router's web interface and valid authentication credentials. Successful exploitation exposes sensitive DDNS account information, which can be used to take over DNS records pointing to the victim's network. No patch information is currently available.

Affected products

Netcore NR255-V 1.5.130703

Timeline

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

References

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