High severity8.8NVD Advisory· Published Aug 13, 2026· Updated Sep 9, 2026

CVE-2026-72840

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.

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Affected products

Openwrt/luci-mod-system-mountsllm-create
Openwrt/Lucillm-fuzzy

Patches

Vulnerability mechanics

References

github.com/openwrt/luci/security/advisories/GHSA-v5f9-62c7-cw29nvd
www.vulncheck.com/advisories/openwrt-luci-luci-mod-system-mounts-acl-root-rce-via-crontab-writenvd

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