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.

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 a…

Vulnerability class: XSS (Cross-Site Scripting)

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-2026-61876?: 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.