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CVE-2026-61876 is a critical cross-site scripting (XSS) vulnerability in the OpenWrt LuCI interface. It occurs because DHCPv6 lease hostnames are not properly encoded before being displayed in status tables. An adjacent network attacker can exploit this by sending a DHCPv6 Client FQDN containing malicious script tags, which execute in the administrator's browser when viewing the DHCP lease pages.

The vulnerability in OpenWrt's LuCI web interface arises from improper neutralization of input during web page generation. Specifically, DHCPv6 lease hostnames are rendered without proper encoding, allowing injection of HTML markup. This enables an attacker on the adjacent network to craft a DHCPv6 Client FQDN with embedded script tags that execute in the context of the administrator's browser when they access the DHCP lease status page, leading to cross-site scripting.

Exploit code for LuCI DHCPv6 -  Lease Hostname Stored Cross-Site Scripting

Detailed information about CVE-2026-61876: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in openwrt luci affecting openwr

CVE-2026-61876: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in openwrt luci - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-61876: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in openwrt luci

Threats Tagged 'openwrt 25.12.0-rc1 x86_64'

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Threats Tagged 'openwrt 25.12.0-rc1 x86_64'

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