---
title: "CVE-2026-76852: Netcore NR268 - Authentication Bypass"
description: "Netcore NR268 firmware version 1.7.121109 contains an authentication bypass caused by improper integrity verification in mtd_write, letting attackers bypass firmware signature validation and load unauthorized firmware images, exploit requires access to put_file.cgi and check_image_uuid.c."
url: https://panop.io/threat-heartbeat/CVE-2026-76852/
---

# CVE-2026-76852 Netcore NR268 - Authentication Bypass

Netcore NR268 firmware version 1.7.121109 contains an authentication bypass caused by improper integrity verification in mtd\_write, letting attackers bypass firmware signature validation and load unauthorized firmware images, exploit requires access to put\_file.cgi and check\_image\_uuid.c.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.27% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76852)

## Details

Type

Authentication Bypass

Impact

Privilege Escalation

CVSS vector

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

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-354](https://cwe.mitre.org/data/definitions/354.html)

## Vendor fix

Update to the latest firmware version.

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-2026-76852](https://nvd.nist.gov/vuln/detail/CVE-2026-76852)
- [https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr268-firmware-forgery.md](https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr268-firmware-forgery.md)
- [https://www.vulncheck.com/advisories/netcore-nr268-1.7.121109-forgeable-firmware-authenticity-check-in-mtd-write](https://www.vulncheck.com/advisories/netcore-nr268-1.7.121109-forgeable-firmware-authenticity-check-in-mtd-write)

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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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