XSS in Openwrt Luci
CVE-2026-61876
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.
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: 0.013 (69.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/openwrt/luci/security/advisories/GHSA-686p-p8p9-x6fh (vendor-advisory)
- www.vulncheck.com/advisories/luci-dhcpv6-lease-hostname-stored-cross-site-scrip… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-61876?
- CVE-2026-61876 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-2026-61876?
- High severity. CVSS v3 base score is 8.8 out of 10.