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CVE-2026-61876

CriticalPublished

LuCI DHCPv6 Lease Hostname Stored Cross-Site Scripting

Published: Jul 12, 2026
Updated: Jul 14, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 11, 2026

Primary CVSS

9.4/ 10Critical

nvd · CVSS 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

1.3%

Low · next 30 days

Percentile: 68.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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 administrator's browser when viewing DHCP lease pages.

Sources

LuCI DHCPv6 - Lease Hostname Stored Cross-Site ScriptingExploit
banyamer · multiple · Aug 11, 2026

Responsible use

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