Is CVE-2026-61876 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-61876 being exploited in the wild.

How severe is CVE-2026-61876?

High severity, with a CVSS score of 8.8, published 12 July 2026.

Is there a fix for CVE-2026-61876?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-61876 attacked?

It is attacked from the adjacent network, in a web application.

Am I affected by CVE-2026-61876?

Check whether you run OpenWrt LuCI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-61876: OpenWrt LuCI stored XSS in DHCPv6 lease status tables

CVE-2026-61876 · Severity: high · CVSS 8.8 · Published 2026-07-12

LuCI, the web interface for OpenWrt routers, contains a security flaw in how it displays network device names. An attacker on the local network can send a specially crafted device name that, when viewed by a router administrator, executes malicious code in the admin's browser. This could allow the attacker to change router settings, steal session information, or gain unauthorized access to the management interface.

Technologies: OpenWrt LuCI. Vendors: OpenWrt.

Quick answers

Is CVE-2026-61876 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-61876 being exploited in the wild.
How severe is CVE-2026-61876?: High severity, with a CVSS score of 8.8, published 12 July 2026.
Which products and versions are affected?: OpenWrt LuCI master.
Is there a fix for CVE-2026-61876?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-61876 attacked?: It is attacked from the adjacent network, in a web application.
Am I affected by CVE-2026-61876?: Check whether you run OpenWrt LuCI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A stored cross-site scripting (XSS) vulnerability exists in LuCI due to improper neutralization of DHCPv6 Client FQDN (hostname) data. An unauthenticated adjacent-network attacker can send a DHCPv6 Solicit/Request containing HTML markup in the FQDN option. The odhcpd daemon stores this value, which is subsequently retrieved by luci-rpc.getDHCPLeases and rendered via innerHTML in the LuCI status and DHCP configuration tables (specifically in luci-mod-status and luci-mod-network). When an authenticated administrator views the 'Status > Overview' or 'Network > DHCP and DNS' pages, the injected script executes in the context of their session. The vulnerability is rooted in the use of L.dom.append() with raw strings in cbi.js and ui.js.

Affected products

OpenWrt LuCI master

Timeline

2026-06-27: advisory: GitHub Security Advisory published by OpenWrt developers
2026-07-12: disclosed: CVE published to NVD dataset

References

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