CVE-2026-61876

HIGH

LuCI DHCPv6 Lease Hostname Stored Cross-Site Scripting

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-686p-p8p9-x6fh)
https://github.com/openwrt/luci/security/advisories/GHSA-686p-p8p9-x6fh
Third Party Advisory third-party-advisory
VulnCheck Advisory: LuCI DHCPv6 Lease Hostname Stored Cross-Site Scripting
https://www.vulncheck.com/advisories/luci-dhcpv6-lease-hostname-stored-cross-site-scripting

Scores

CVSS v3 8.8
EPSS 0.0020
EPSS Percentile 10.0%
Attack Vector ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-79
Status published
Products (1)
openwrt/luci
Published Jul 12, 2026
Tracked Since Jul 12, 2026