Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M

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

Critical 9.6

In plain English

A critical-severity cross-site scripting in openwrt from openwrt. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).

Severity (CVSS 3.1)9.6Critical

Exploit odds (30 days)0.6%top 52.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
openwrt	openwrt	< 25.12.5

Weakness: CWE-79, CWE-117, CWE-150 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f x_refsource_CONFIRM
https://github.com/openwrt/odhcpd/pull/404 x_refsource_MISC
https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a x_refsource_MISC
https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a x_refsource_MISC
https://github.com/openwrt/openwrt/releases/tag/v25.12.5 x_refsource_MISC