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Netcore NR255-V CVE-2026-76858

| EUVDEUVD-2026-80061 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-09-15 disclosure@vulncheck.com GHSA-wjhw-7xcr-gr58
4.8
CVSS 4.0 · Vendor: vulncheck
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Severity by source

Vendor (vulncheck) PRIMARY
4.8 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (vulncheck) · only source for this CVE.

CVSS VectorVendor: vulncheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
P
Scope
X

Lifecycle Timeline

1
Analysis Generated
Sep 15, 2026 - 22:33 vuln.today

DescriptionCVE.org

Netcore NR255-V version 1.5.130703 contains a stored cross-site scripting vulnerability in ddns_wan_list_show.cgi caused by unsafe eval() handling of DDNS data. Attackers can inject malicious script through the DDNS configuration path, leading to persistent execution when the affected page is viewed.

AnalysisAI

Stored cross-site scripting in Netcore NR255-V firmware 1.5.130703 lets an authenticated administrator plant malicious JavaScript through the router's DDNS configuration, which then executes persistently every time the DDNS WAN list page (ddns_wan_list_show.cgi) is opened. The flaw stems from unsafe eval() handling of DDNS-supplied data in that CGI endpoint, so the injected payload is saved with the device configuration and survives page reloads and reboots. …

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CVE-2026-76858 vulnerability details – vuln.today

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