by Kastro
Paper/Archive/CVE-2026-61876

CVE-2026-61876

openwrt luci — LuCI DHCPv6 Lease Hostname Stored Cross-Site Scripting

EPSS 2%public exploitCVSS 9.4
critical.is priorityof 100
53
CVSS 9.4 (CNA)9.4 / 10 × 3028.2Not in CISA KEV+300.0EPSS percentile 76.1.761 × 2015.2Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
lucisee advisory–CNA

Scores by source

VulnCheck (CNA)9.4CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
VulnCheck (CNA)8.8CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/openwrt/luci/security/advisories/GHSA-686p-p8p9-x6fhwriteupvulncheck.com/advisories/luci-dhcpv6-lease-hostname-stored-cross-site-scripting