CVE-2026-72840: high-severity vulnerability in openwrt luci
OpenWrt LuCI luci-mod-system-mounts ACL Root RCE via Crontab Write
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.4%
OpenWrt LuCI contains an overly permissive ACL definition in luci-mod-system-mounts that grants write access to /etc/crontabs/root to users intended only for mount configuration. Authenticated users with only the mount-configuration ACL group can append arbitrary cron entries via ubus file.write, which the default busybox crond daemon executes as root within one minute.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
openwrt · luciRelated CVEs — openwrt luci
In the same product, most dangerous first.
CVE-2026-69096HIGHOpenWrt luci-app-dockerman Read ACL Remote Code ExecutionEPSS 3.3%CVE-2026-61876CRITICALLuCI DHCPv6 Lease Hostname Stored Cross-Site ScriptingEPSS 1.6%CVE-2026-69095HIGHOpenWrt luci-app-bmx7 Path Traversal via bmx7-infoEPSS 0.9%CVE-2026-59260HIGHOpenWrt luci-app-samba4 read ACL remote code execution via smbdEPSS 0.9%CVE-2026-55897HIGHluci-app-advanced-reboot read ACL exposes /bin/sh through file.exec, allowing delegated users to run commands as rootEPSS 0.7%CVE-2026-72842CRITICALOpenWrt luci-app-lxc ACL Inconsistency Authentication BypassEPSS 0.6%