{"id":"CVE-2026-61876","aliases":["EUVD-2026-43236","GHSA-8gvq-r3c7-vwmv"],"status":"published","title":"LuCI DHCPv6 Lease Hostname Stored Cross-Site Scripting","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.","severity":{"version":"4.0","score":9.4,"vector":"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","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01621,"percentile":0.76282,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-79"],"published":"2026-07-12T12:07:55Z","modified":"2026-10-24T22:10:00Z","exploits":[{"source":"exploitdb","id":"EDB-52637","title":"LuCI DHCPv6 -  Lease Hostname Stored Cross-Site Scripting","type":"dos","platform":"multiple","date":"2026-08-11","url":"https://www.exploit-db.com/exploits/52637"}],"products":[{"vendor":"openwrt","product":"luci"}],"references":[{"url":"https://github.com/openwrt/luci/security/advisories/GHSA-686p-p8p9-x6fh","tags":["vendor-advisory","exploit"]},{"url":"https://www.vulncheck.com/advisories/luci-dhcpv6-lease-hostname-stored-cross-site-scripting","tags":["third-party-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61876"},{"url":"https://github.com/advisories/GHSA-8gvq-r3c7-vwmv"}],"sources":{"cve":[{"id":"CVE-2026-61876","title":"LuCI DHCPv6 Lease Hostname Stored Cross-Site Scripting","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.","status":"published","published":"2026-07-12T12:07:55.788Z","modified":"2026-07-14T22:03:45.641Z","cvss":[{"version":"4.0","score":9.4,"vector":"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","level":"critical","assessor":"cna"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:19:53.786088Z"}],"euvd":[{"id":"EUVD-2026-43236","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.","status":"published","published":"2026-07-12T12:07:55Z","modified":"2026-07-14T22:03:45Z","cvss":[{"version":"4.0","score":9.4,"vector":"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","level":"critical"}],"updated_at":"2026-11-02T18:19:57.359664Z"}],"ghsa":[{"id":"GHSA-8gvq-r3c7-vwmv","title":"LuCI versions fail to properly encode DHCPv6 lease hostnames before rendering in status tables,...","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.","status":"published","published":"2026-07-12T12:31:48Z","modified":"2026-07-12T12:31:59Z","cvss":[{"version":"4.0","score":9.4,"vector":"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","level":"critical"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:09:24.680615Z"}],"nvd":[{"id":"CVE-2026-61876","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.","status":"published","published":"2026-07-12T12:16:46.4Z","modified":"2026-10-24T22:10:00.21Z","cvss":[{"version":"4.0","score":9.4,"vector":"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","level":"critical","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:28.771746Z"}]}}