CVE-2026-76856Network attack vector

Network configuration changes via forged administrator requests

Published Sep 15, 2026 · Updated Sep 15, 2026

CSRF in Netcore NR255-V firmware 1.5.130703 allows remote attackers to alter WAN or LAN settings through an administrator's browser. The wan_config_set_cgi, wan_num_set_cgi, and lan_ip_change_cgi handlers process forged state-changing requests; public sources do not identify the omitted request validation. Exploitation requires an authenticated administrator's browser, and successful requests modify operational network configuration without consent.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in Netcore NR255-V firmware 1.5.130703 allows remote attackers to alter WAN or LAN settings through an administrator's browser. The wan_config_set_cgi, wan_num_set_cgi, and lan_ip_change_cgi handlers process forged state-changing requests; public sources do not identify the omitted request validation. Exploitation requires an authenticated administrator's browser, and successful requests modify operational network configuration without consent.

The record

CVE
CVE-2026-76856
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Netcore
Product
NR255-V
Classifications
T1565.001, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.5.130703

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Netcore · NR255-Vversion=1.5.130703

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1565.001Stored Data Manipulation
T1204User Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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