CVE-2026-72840
published 2026-08-13CVE-2026-72840: 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…
PriorityP359high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
0.44%
36.3th percentile
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.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| openwrt | luci | <= 24.10.8 | — |
| openwrt | luci | 25.12.0 – 25.12.5 | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv4.08.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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GHSA
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.
ghsa_unreviewed·2026-08-14
CVE-2026-72840 [HIGH] CWE-266 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.
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.
VulDB
OpenWrt luci-mod-system-mounts /etc/crontabs/root file.write privileges management
vuldb·2026-08-14·CVSS 8.8
CVE-2026-72840 [HIGH] OpenWrt luci-mod-system-mounts /etc/crontabs/root file.write privileges management
A vulnerability was found in OpenWrt. It has been classified as problematic. This affects the function file.write of the file /etc/crontabs/root of the component luci-mod-system-mounts. Performing a manipulation results in improper privilege management.
This vulnerability is cataloged as CVE-2026-72840. It is possible to initiate the attack remotely. There is no exploit available.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-08-13
Published