CVE-2026-61875 luci-app-upnp Stored XSS via UPnP Port Mapping Description
Unauthenticated LAN clients can inject JavaScript via UPnP port mapping descriptions, leading to stored XSS when administrators view the interface.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-61875?
CVE-2026-61875 is a high-severity cross-site scripting vulnerability in openwrt luci, published on 12 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
luci-app-upnp contains a stored cross-site scripting vulnerability that allows unauthenticated LAN clients to inject JavaScript via UPnP IGD AddPortMapping SOAP requests. Attackers can send malicious HTML in the NewPortMappingDescription field, which miniupnpd stores and luci-app-upnp renders without output encoding, executing the payload when administrators view the UPnP or Status pages.
Weakness: CWE-79
Which versions are affected by CVE-2026-61875?
How do I fix CVE-2026-61875?
No fix has been published for CVE-2026-61875 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-2026-61875 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61875 exists.
Sources
Also known as GHSA-xwgp-pprm-vcx3.