CVE-2026-72840

High

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.

SeverityHigh

CVSS8.8

Exploit probability—

ProductOpenwrt Luci

PublishedAug 13, 2026

First seenAug 13, 2026

Weakness typeCWE-266CWE-266

How to fix

Vendor advisories

github.com/openwrt/luci/security/advisories/GHSA-v5f9-62c7-cw29

Affected products

Product	Affected versions	Fixed in
openwrt luci	v ≤ 24.10.8, 25.12.0 ≤ v ≤ 25.12.5	—

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.