CVE-2026-61876 | LuCI versions fail to properly encode DHCPv6 lease hostnames… | CVSS 8.8 HIGH

Description

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.

Metadata

CVE ID: CVE-2026-61876
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-10 21:54 UTC
Published: 2026-07-12 12:07 UTC
Last updated: 2026-07-12 12:07 UTC
Primary CWE: CWE-79
Improper Neutralization of Input During Web Page Generation …
Vendor / Product: openwrt / luci
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products (1)

Vendor	Product	Platform	Versions
openwrt	luci	—	—

Weakness (CWE)

CWE	Source	Description
CWE-79	cna	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.4	CRITICAL	4.0	cna	CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
8.8	HIGH	3.1	cna	CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References (2)

GitHub Security Advisory (GHSA-686p-p8p9-x6fh) https://github.com/openwrt/luci/security/advisories/GHSA-686p-p8p9-x6fh
VulnCheck Advisory: LuCI DHCPv6 Lease Hostname Stored Cross-Site Scripting https://www.vulncheck.com/advisories/luci-dhcpv6-lease-hostname-stored-cross-site-scripting