---
title: "CVE-2026-76856: Netcore NR255-V - Cross-Site Request Forgery"
description: "Netcore NR255-V firmware version 1.5.130703 contains a cross-site request forgery caused by lack of proper request validation in wan_config_set_cgi, wan_num_set_cgi, and lan_ip_change_cgi endpoints, letting attackers trick authenticated administrators into modifying WAN or LAN network configurations without consent, exploit requires administrator authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-76856/
---

# CVE-2026-76856 Netcore NR255-V - Cross-Site Request Forgery

Netcore NR255-V firmware version 1.5.130703 contains a cross-site request forgery caused by lack of proper request validation in wan\_config\_set\_cgi, wan\_num\_set\_cgi, and lan\_ip\_change\_cgi endpoints, letting attackers trick authenticated administrators into modifying WAN or LAN network configurations without consent, exploit requires administrator authentication.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.19% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76856)

## Details

Type

Cross-Site Request Forgery

Impact

Broken Access Control

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-352](https://cwe.mitre.org/data/definitions/352.html)

## Vendor fix

Update to the latest firmware version that patches this vulnerability.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-76856](https://nvd.nist.gov/vuln/detail/CVE-2026-76856)
- [https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-csrf-wan-reconfig.md](https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-csrf-wan-reconfig.md)
- [https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-cross-site-request-forgery-in-wan-lan-configuration-endpoints](https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-cross-site-request-forgery-in-wan-lan-configuration-endpoints)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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