Vulnerabilities CVE-2026-72840

CVE-2026-72840

High

Open

TLP:CLEAR

OpenWrt LuCI luci-mod-system-mounts ACL Root RCE via Crontab Write

NVD CVE.org

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Description

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.

Details

CVSS Score: 8.7
EPSS Score ⓘ: 0.30%

22.8th percentile
CVSS Vector: 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
Confidence: 90%
Published: Aug 13, 2026
Last Modified: Aug 14, 2026

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