CVE-2026-61876 LuCI DHCPv6 Lease Hostname Stored Cross-Site Scripting
Attackers can inject malicious scripts via DHCPv6 hostnames, executing code in the administrator's browser when viewing lease tables.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-61876?
CVE-2026-61876 is a critical cross-site scripting vulnerability in openwrt luci, published on 12 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-61876?
How do I fix CVE-2026-61876?
No fix has been published for CVE-2026-61876 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-61876 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61876 exists.
Public exploit code: 1 Exploit-DB entry.
Sources
Also known as GHSA-8gvq-r3c7-vwmv.