OpenWrt LuCI luci-mod-system-mounts ACL Root RCE via Crontab Write
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.
CVE-2026-72840
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-72840
luci
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "openwrt",
"modules": [
"luci-mod-system"
],
"product": "luci",
"versions": [
{
"status": "affected",
"version": "0",
"versionType": "custom",
"lessThanOrEqual": "24.10.8"
},
{
"status": "affected",
"version": "25.12.0",
"versionType": "custom",
"lessThanOrEqual": "25.12.5"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-72840
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #4760 · Revision 1
- Added to Heist Feed
- Publisher date