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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (29.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/openwrt/luci/security/advisories/GHSA-8v49-6387-7f89 (vendor-advisory)
- www.vulncheck.com/advisories/luci-app-upnp-stored-xss-via-upnp-port-mapping-des… (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.