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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History

Sat, 15 Aug 2026 01:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 14 Aug 2026 17:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:openwrt:luci:*:*:*:*:*:*:*:*

Fri, 14 Aug 2026 00:30:00 +0000

Type Values Removed Values Added
First Time appeared Openwrt
Openwrt luci
Vendors & Products Openwrt
Openwrt luci

Thu, 13 Aug 2026 22:15:00 +0000

Type Values Removed Values Added
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.
Title OpenWrt LuCI luci-mod-system-mounts ACL Root RCE via Crontab Write
Weaknesses CWE-266
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, '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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-14T19:03:37.329Z

Reserved: 2026-08-10T15:13:41.486Z

Link: CVE-2026-72840

cve-icon Vulnrichment

Updated: 2026-08-14T19:03:12.895Z

cve-icon NVD

Status : Deferred

Published: 2026-08-13T22:17:23.640

Modified: 2026-09-09T20:35:08.537

Link: CVE-2026-72840

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-14T00:45:17Z

Weaknesses