An ACL inconsistency in the OpenWrt LuCI LXC application allows authenticated users with low privileges to bypass authorization and execute arbitrary...
Description
An ACL inconsistency in the OpenWrt LuCI LXC application allows authenticated users with low privileges to bypass authorization and execute arbitrary code as root on the host.
AI Analyst Comment
Remediation
Update openwrt luci to the latest version. Check the vendor security advisory for specific patch details. Monitor for exploitation attempts and review access logs.
Description Summary:
An ACL inconsistency in the OpenWrt LuCI LXC application allows authenticated users with low privileges to bypass authorization and execute arbitrary code as root on the host.
Executive Summary:
A critical authorization bypass and path traversal vulnerability in the OpenWrt LuCI LXC application allows low-privileged users to achieve root code execution on the host system.
Vulnerability Details
CVE-ID: CVE-2026-72842
Affected Software: openwrt luci
Affected Versions: openwrt luci
Vulnerability: This vulnerability, classified as CWE-73, involves an ACL inconsistency that permits path traversal via the lxc_name parameter. By escaping container directories, an authenticated user with low privileges can trigger host-side scripts, resulting in root-level code execution on the OpenWrt host.
Business Impact
The CVSS score of 9.9 highlights the extreme danger of this flaw. By allowing a low-privileged user to escalate to root-level host control, the vulnerability enables complete compromise of the network device, which can be used to intercept traffic, modify configurations, or pivot into internal network segments.
Remediation Plan
Immediate Action: Update the OpenWrt LuCI installation to the latest version as specified in the official vendor security advisory.
Proactive Monitoring: Review LuCI access logs for suspicious input sequences, specifically searching for path traversal patterns like /.%2E.
Compensating Controls: Limit administrative access to the LuCI interface to trusted management networks and strictly enforce the principle of least privilege for all user accounts.
Exploitation Status
Public Exploit Available: No
Analyst Notes: As of August 13, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. The flaw's complexity requires authenticated access, but the impact of full host compromise makes it a high-priority concern for network administrators.
Analyst Recommendation
Given the potential for root-level host execution, this vulnerability poses a severe threat to network integrity. Administrators should consult the OpenWrt security advisory immediately to identify the correct patched version and apply the update to all affected devices.