CVE-2026-61876: LuCI DHCPv6 Lease Hostname Stored Cross-Site Scripting

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-07-12 · updated 2026-10-24
Weakness: CWE-79

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.

Affected products

openwrt luci: all versions

References

https://github.com/openwrt/luci/security/advisories/GHSA-686p-p8p9-x6fh
https://www.vulncheck.com/advisories/luci-dhcpv6-lease-hostname-stored-cross-site-scripting
https://github.com/openwrt/luci/security/advisories/GHSA-686p-p8p9-x6fh

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