Critical 9.6Published Jul 15, 2026

CVE-2026-62948OpenWrt odhcpd/LuCI: unauthenticated DHCPv6 client can inject lease-file lines via FQDN hostname → stored XSS in the LuCI admin UI

Updated under an hour ago (Oct 28, 2026, 5:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

OpenWrt is a Linux operating system targeting embedded devices. Prior to 25.12.5, odhcpd writes a DHCPv6 client FQDN option 39 hostname into /tmp/odhcpd.leases through src/statefiles.c statefiles_write_state6() and statefiles_write_state4() without escaping, allowing newline injection of forged lease lines that LuCI rpcd-mod-luci getDHCPLeases displays through htdocs/luci-static/resources/view/status/include/40_dhcp.js and htdocs/luci-static/resources/luci.js dom.append as live HTML in the Active DHCPv6 Leases admin page. This vulnerability is fixed in 25.12.5.

CVSS: 9.6 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-79, CWE-117, CWE-150
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

openwrt openwrt openwrt:openwrt (from the name)	before 25.12.5	CNA record
openwrt openwrt openwrt:openwrt	before 25.12.5	NVD

References

References

https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f	x-refsource-confirm, exploit, mitigation, vendor-advisory
https://github.com/openwrt/odhcpd/pull/404	x-refsource-misc, issue-tracking, patch
https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a	x-refsource-misc, patch
https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a	x-refsource-misc, patch
https://github.com/openwrt/openwrt/releases/tag/v25.12.5	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.