What is CVE-2026-61875?

CVE-2026-61875 is a high-severity vulnerability in Openwrt Luci, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-07-12.

How severe is CVE-2026-61875?

High severity. CVSS v3 base score is 8.8 out of 10.

XSS in Openwrt Luci

CVE-2026-61875

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.006 (43.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Openwrt Luci

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-61875?: CVE-2026-61875 is a high-severity vulnerability in Openwrt Luci, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-07-12.
How severe is CVE-2026-61875?: High severity. CVSS v3 base score is 8.8 out of 10.