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OpenWrt LuCI luci-mod-system-mounts ACL Root RCE via Crontab Write

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

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
Read the original announcement