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  4. CVE 2026 72840 openwrt luci luci mod system mounts acl root rce
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Back to active CVEs
High · CVSS 8.7CVE-2026-72840

OpenWrt LuCI luci-mod-system-mounts ACL Root RCE via Crontab WriteCVE-2026-72840

Answer in brief

CVE-2026-72840 records a High severity (CVSS 8.7) vulnerability in OpenWrt LuCI luci-mod-system-mounts ACL Root RCE via Crontab Write. The current sources do not mark it as known exploited. The current feed maps openwrt/luci (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 13, 2026Updated Sep 30, 2026Source checked Nov 12, 2026First seen by HOL Aug 13, 2026Material review Sep 30, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps openwrt/luci (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
openwrt/lucigeneric>=0 <=24.10.8 || >=25.12.0 <=25.12.5Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for openwrt/luci.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Aug 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 13, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-266
Source
CVE List V5
Source checked
Nov 12, 2026
References
2 linked sources
Open source record