CVE-2026-72840
OpenWrt LuCI luci-mod-system-mounts ACL Root RCE via Crontab Write
- State
- Published
- Severity
- 8.7 High
- Published
- Aug 13, 2026
- Updated
- Sep 30, 2026
- Reserved
- Aug 10, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-266 Incorrect Privilege Assignment
Affected Products
| Product | Versions |
|---|---|
luciopenwrt |
|
References
- GitHub Security Advisory (GHSA-v5f9-62c7-cw29)vendor-advisory
- VulnCheck Advisory: OpenWrt LuCI luci-mod-system-mounts ACL Root RCE via Crontab Writethird-party-advisory
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