CVE-2026-61876Public exploit

Administrator-session script execution via raw lease hostnames

Published Jul 12, 2026 · Updated Jul 12, 2026

Stored XSS in OpenWrt LuCI allows remote attackers on the adjacent network to execute JavaScript through DHCPv6 lease hostnames. The DHCP lease tables pass lease.hostname as a bare string through cbi_update_table() to L.dom.append(), which assigns it to innerHTML without text encoding. No LuCI credentials are needed to plant the value, but an authenticated administrator must view the Status Overview or Network DHCP and DNS page, enabling actions in that administrator's LuCI session.

CVSS severity9.4
Critical
EPSS probability1.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in OpenWrt LuCI allows remote attackers on the adjacent network to execute JavaScript through DHCPv6 lease hostnames. The DHCP lease tables pass lease.hostname as a bare string through cbi_update_table() to L.dom.append(), which assigns it to innerHTML without text encoding. No LuCI credentials are needed to plant the value, but an authenticated administrator must view the Status Overview or Network DHCP and DNS page, enabling actions in that administrator's LuCI session.

The record

CVE
CVE-2026-61876
Published
Jul 12, 2026
Updated
Jul 12, 2026
Vendor
OpenWrt
Product
LuCI
Classifications
CWE-79, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

OpenWrt · LuCIAffected versions are unavailable in this record.

Published CVSS scores

8.8OpenWrt GitHub Security AdvisoryCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
9.4VulnCheckCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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