CVE-2026-72840

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-14. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
56(Track*)
EG Risk 56/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 14, 2026

Advisory Details (2)

Auto-updated Aug 13, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

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

https://www.vulncheck.com/advisories/openwrt-luci-luci-mod-system-mounts-acl-root-rce-via-crontab-write
github Patch Available🟡 PoC Available

luci-mod-system-mountsL: ACL grants stale /etc/crontabs/root write, delegated mounts user gains root RCE · Advisory · openwrt/luci · GitHub

https://github.com/openwrt/luci/security/advisories/GHSA-v5f9-62c7-cw29

Vendor Advisories for CVE-2026-72840(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 37× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-21 05:29 UTCEG score recompute
  2. 2026-08-21 05:29 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 17:48 UTCGHSA enrichment
  5. 2026-08-20 06:07 UTCGHSA enrichment
  6. 2026-08-19 18:26 UTCEG score recompute
  7. 2026-08-19 18:26 UTCGHSA enrichment
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-19 06:21 UTCGHSA enrichment
  10. 2026-08-18 18:31 UTCEG score recompute
  11. 2026-08-18 18:31 UTCGHSA enrichment
  12. 2026-08-18 13:49 UTCEPSS rescore
  13. 2026-08-18 13:49 UTCEPSS rescore
  14. 2026-08-18 06:50 UTCGHSA enrichment
  15. 2026-08-17 19:10 UTCEG score recompute
  16. 2026-08-17 19:09 UTCGHSA enrichment
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-17 06:02 UTCGHSA enrichment
  19. 2026-08-16 18:18 UTCEG score recompute
  20. 2026-08-16 18:18 UTCGHSA enrichment
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 06:37 UTCEG score recompute
  24. 2026-08-16 06:37 UTCGHSA enrichment
  25. 2026-08-16 02:15 UTCEPSS rescore
Show 15 more
  1. 2026-08-15 18:57 UTCGHSA enrichment
  2. 2026-08-15 07:17 UTCEG score recompute
  3. 2026-08-15 07:17 UTCGHSA enrichment
  4. 2026-08-15 01:31 UTCEPSS rescore
  5. 2026-08-14 19:36 UTCEG score recompute
  6. 2026-08-14 19:36 UTCGHSA enrichment
  7. 2026-08-14 19:14 UTCEG score recompute
  8. 2026-08-14 19:14 UTCGHSA enrichment
  9. 2026-08-14 17:06 UTCEG score recompute
  10. 2026-08-14 17:06 UTCGHSA enrichment
  11. 2026-08-14 10:05 UTCEG score recompute
  12. 2026-08-14 10:05 UTCGHSA enrichment
  13. 2026-08-13 22:25 UTCEG score recompute
  14. 2026-08-13 22:09 UTCEG score recompute
  15. 2026-08-13 22:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-72840?
CVE-2026-72840 is a high vulnerability published on August 13, 2026. 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,…
When was CVE-2026-72840 disclosed?
CVE-2026-72840 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-72840 actively exploited?
CVE-2026-72840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 76.9% of all scored CVEs.
What is the CVSS score of CVE-2026-72840?
CVE-2026-72840 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-72840?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72840, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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