CVE-2026-61876 | THREATINT

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.

PUBLISHED Reserved 2026-07-10 | Published 2026-07-12 | Updated 2026-07-14 | Assigner VulnCheck

CRITICAL: 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

HIGH: 8.8CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Problem types

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status

affected

Credits

lujiefsi reporter

References

github.com/...t/luci/security/advisories/GHSA-686p-p8p9-x6fh exploit

github.com/...t/luci/security/advisories/GHSA-686p-p8p9-x6fh (GitHub Security Advisory (GHSA-686p-p8p9-x6fh)) vendor-advisory

www.vulncheck.com/...se-hostname-stored-cross-site-scripting (VulnCheck Advisory: LuCI DHCPv6 Lease Hostname Stored Cross-Site Scripting) third-party-advisory

cve.org (CVE-2026-61876)

nvd.nist.gov (CVE-2026-61876)

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