---
id: CVE-2026-61876
title: >-
  LuCI versions fail to properly encode DHCPv6 lease hostnames before rendering
  in status tables, allowing adjacent network attackers to inject HTML markup
summary: >-
  LuCI versions fail to properly encode DHCPv6 lease hostnames before rendering
  in status tables, allowing adjacent network attackers to inject HTML markup.
  Attackers can send a DHCPv6 Client FQDN containing script tags that execute in
  the…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-79
published: '2026-07-12'
updated: '2026-07-12'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61876'
references:
  - url: 'https://github.com/openwrt/luci/security/advisories/GHSA-686p-p8p9-x6fh'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/luci-dhcpv6-lease-hostname-stored-cross-site-scripting
    label: disclosure@vulncheck.com
tags:
  - nvd
  - exploit-available
ingestedAt: '2026-07-12T12:20:14.107Z'
epss: 0.01277
epssPercentile: 0.68709
exploitAvailable: true
exploits:
  exploitdb: true
  checkedAt: '2026-09-24T07:53:11.159Z'
---

## Overview

LuCI versions fail to properly encode DHCPv6 lease hostnames before rendering in status tables, allowing adjacent network attackers to inject HTML markup. Attackers can send a DHCPv6 Client FQDN containing script tags that execute in the administrator's browser when viewing DHCP lease pages.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.