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TI-2026-51066 Aliases CVE-2026-72840GHSA-6vfc-74mf-qrmj

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

Priority HIGH 73CWE-266Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-266.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00442 38th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
openwrtluciup to 24.10.8; 25.12.0 – 25.12.5—No fix listedCNA
  • luci Vendoropenwrt Affected up to 24.10.8; 25.12.0 – 25.12.5 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-72840
  2. 2026-10-03 Alias added: GHSA-6vfc-74mf-qrmj

References

Advisory 1

  • TI-2026-79903 Stack buffer overflow in odhcpd DHCPv6 IA reply handling CVSS 3.1CRITICAL 9.8
  • TI-2024-13053 Improper input validation in MediaTek MT6890, MT7915, MT7916, MT7981, MT7986 CVSS 3.1CRITICAL 9.8
  • TI-2026-79901 Use-after-free in odhcpd DHCPv6 IA handling CVSS 4.0HIGH 8.8
  • TI-2026-48502 OpenWrt luci-app-bmx7 Path Traversal via bmx7-info CVSS 4.0HIGH 8.7
  • TI-2026-44407 luci-app-banip Log Monitor IP Extraction Bypass CVSS 4.0HIGH 8.7
  • TI-2026-51067 luci-app-openvpn Path Traversal RCE via instance_name2 CVSS 4.0CRITICAL 9.4
See all 168 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences