# CVE-2026-76853: Netcore NR268 security check bypass in parame_put_file.cgi

Source: https://junglewise.ai/threats/cve-2026-76853-netcore-nr268-security-check-bypass-in-parame-put-file-cgi  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-76853 · Severity: high · CVSS 8.1 · Published 2026-09-15

The Netcore NR268 is a network router used to manage and secure internet connectivity in homes and small offices. A flaw in its firmware restore functionality allows authenticated attackers to bypass security checks and restore malicious configuration files, potentially compromising the entire network and all connected devices.

Technologies: [Netcore NR268](https://junglewise.ai/threats/technologies/nr268). Vendors: [Netcore](https://junglewise.ai/threats/vendors/netcore).

## Quick answers

**Is CVE-2026-76853 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-76853 being exploited in the wild.

**How severe is CVE-2026-76853?** High severity, with a CVSS score of 8.1, published 15 September 2026.

**Which products and versions are affected?** Netcore NR268 1.7.121109.

**Is there a fix for CVE-2026-76853?** 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-2026-76853 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-76853?** Check whether you run Netcore NR268 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 a security check bypass (CWE-353: Missing Support for Integrity Check) in the parame_put_file.cgi component, specifically in the prefix validation logic within put_parame_file_cgi.c. An authenticated attacker can craft a restore archive that bypasses the prefix check, allowing them to restore arbitrary configuration files to the device. The vulnerability requires authentication (PR:L) and network access; exploitation does not require user interaction. A successful attack enables an attacker to modify device configuration with high integrity impact (VI:H) and availability impact (VA:H), potentially leading to complete device compromise.

## Affected products

- Netcore NR268 1.7.121109

## Timeline

- 2026-09-15: disclosed
- 2026-09-04: advisory: Public reference published on GitHub

## References

- [https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr268-restore-bypass.md](https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr268-restore-bypass.md)
- [https://www.vulncheck.com/advisories/netcore-nr268-1.7.121109-security-check-bypass-in-parame-put-file-cgi](https://www.vulncheck.com/advisories/netcore-nr268-1.7.121109-security-check-bypass-in-parame-put-file-cgi)

## Related threats

- [Netcore NR268 stored XSS in DHCP Hostname Handler](https://junglewise.ai/threats/cve-2026-108932-a-vulnerability-was-determined-in-netcore-nr268-1-7-121109-this)
- [Netcore NR268 stored cross-site scripting in DHCP handler](https://junglewise.ai/threats/cve-2026-108931-a-vulnerability-was-found-in-netcore-nr268-1-7-121109-this)
- [Netcore NR268 DDNS argument injection](https://junglewise.ai/threats/cve-2026-108929-a-flaw-has-been-found-in-netcore-nr268-1-7-121109-the-affected)
- [Netcore NR268 cross-site request forgery in CGI endpoint](https://junglewise.ai/threats/cve-2026-108909-a-security-flaw-has-been-discovered-in-netcore-nr268-1-7-121109)
- [Netcore NR268 authentication bypass in CGI execution](https://junglewise.ai/threats/cve-2026-108907-a-vulnerability-was-determined-in-netcore-nr268-1-7-121109)