CVE-2026-72840

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM 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(medium)
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
32%
KEV
Not listed

Published

August 13, 2026

Last Modified

September 9, 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 25× in last 7d / 111× 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.

Showing the most recent 100 of 151 total refreshes for this CVE.

  1. 2026-09-20 12:43 UTCGHSA enrichment
  2. 2026-09-19 23:54 UTCEG score recompute
  3. 2026-09-19 23:54 UTCGHSA enrichment
  4. 2026-09-19 12:13 UTCGHSA enrichment
  5. 2026-09-19 00:32 UTCEG score recompute
  6. 2026-09-19 00:32 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-18 12:48 UTCGHSA enrichment
  9. 2026-09-18 00:24 UTCEG score recompute
  10. 2026-09-18 00:24 UTCGHSA enrichment
  11. 2026-09-17 11:59 UTCGHSA enrichment
  12. 2026-09-16 23:51 UTCEG score recompute
  13. 2026-09-16 23:51 UTCGHSA enrichment
  14. 2026-09-16 14:08 UTCEPSS rescore
  15. 2026-09-16 10:28 UTCEG score recompute
  16. 2026-09-16 10:28 UTCGHSA enrichment
  17. 2026-09-16 05:15 UTCEPSS rescore
  18. 2026-09-15 20:10 UTCGHSA enrichment
  19. 2026-09-15 08:30 UTCEG score recompute
  20. 2026-09-15 08:30 UTCGHSA enrichment
  21. 2026-09-15 03:12 UTCEPSS rescore
  22. 2026-09-14 20:45 UTCGHSA enrichment
  23. 2026-09-14 06:17 UTCGHSA enrichment
  24. 2026-09-13 18:36 UTCEG score recompute
  25. 2026-09-13 18:36 UTCGHSA enrichment
Show 75 more
  1. 2026-09-13 06:56 UTCEG score recompute
  2. 2026-09-13 06:56 UTCGHSA enrichment
  3. 2026-09-12 19:03 UTCEG score recompute
  4. 2026-09-12 19:03 UTCGHSA enrichment
  5. 2026-09-12 15:02 UTCEPSS rescore
  6. 2026-09-12 07:22 UTCGHSA enrichment
  7. 2026-09-11 19:42 UTCEG score recompute
  8. 2026-09-11 19:42 UTCGHSA enrichment
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 08:01 UTCGHSA enrichment
  11. 2026-09-10 20:20 UTCEG score recompute
  12. 2026-09-10 20:20 UTCGHSA enrichment
  13. 2026-09-10 09:35 UTCEPSS rescore
  14. 2026-09-10 08:40 UTCGHSA enrichment
  15. 2026-09-09 20:50 UTCGHSA enrichment
  16. 2026-09-09 17:41 UTCGHSA enrichment
  17. 2026-09-09 04:52 UTCEG score recompute
  18. 2026-09-09 04:51 UTCGHSA enrichment
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-08 04:07 UTCGHSA enrichment
  21. 2026-09-07 16:27 UTCEG score recompute
  22. 2026-09-07 16:27 UTCGHSA enrichment
  23. 2026-09-06 23:59 UTCEG score recompute
  24. 2026-09-06 23:59 UTCGHSA enrichment
  25. 2026-09-06 13:48 UTCEPSS rescore
  26. 2026-09-06 12:19 UTCGHSA enrichment
  27. 2026-09-06 00:23 UTCEG score recompute
  28. 2026-09-06 00:23 UTCGHSA enrichment
  29. 2026-09-05 12:40 UTCGHSA enrichment
  30. 2026-09-05 00:28 UTCEG score recompute
  31. 2026-09-05 00:28 UTCGHSA enrichment
  32. 2026-09-04 12:41 UTCEG score recompute
  33. 2026-09-04 12:41 UTCGHSA enrichment
  34. 2026-09-04 05:07 UTCEPSS rescore
  35. 2026-09-04 01:00 UTCGHSA enrichment
  36. 2026-09-03 12:40 UTCGHSA enrichment
  37. 2026-09-03 01:00 UTCEG score recompute
  38. 2026-09-03 01:00 UTCGHSA enrichment
  39. 2026-09-02 14:12 UTCEPSS rescore
  40. 2026-09-02 13:04 UTCGHSA enrichment
  41. 2026-09-01 22:55 UTCEG score recompute
  42. 2026-09-01 22:55 UTCGHSA enrichment
  43. 2026-09-01 13:54 UTCEPSS rescore
  44. 2026-09-01 11:14 UTCEG score recompute
  45. 2026-09-01 11:14 UTCGHSA enrichment
  46. 2026-09-01 04:40 UTCEPSS rescore
  47. 2026-09-01 04:40 UTCEPSS rescore
  48. 2026-08-31 21:30 UTCGHSA enrichment
  49. 2026-08-31 07:31 UTCGHSA enrichment
  50. 2026-08-30 19:46 UTCEG score recompute
  51. 2026-08-30 19:46 UTCGHSA enrichment
  52. 2026-08-30 19:18 UTCEPSS rescore
  53. 2026-08-30 19:17 UTCEPSS rescore
  54. 2026-08-30 08:04 UTCEG score recompute
  55. 2026-08-30 08:03 UTCGHSA enrichment
  56. 2026-08-30 01:22 UTCEPSS rescore
  57. 2026-08-29 20:21 UTCGHSA enrichment
  58. 2026-08-29 07:00 UTCEG score recompute
  59. 2026-08-29 06:59 UTCGHSA enrichment
  60. 2026-08-28 21:42 UTCEPSS rescore
  61. 2026-08-28 13:06 UTCGHSA enrichment
  62. 2026-08-28 00:57 UTCEG score recompute
  63. 2026-08-28 00:57 UTCGHSA enrichment
  64. 2026-08-27 14:25 UTCEPSS rescore
  65. 2026-08-27 13:17 UTCGHSA enrichment
  66. 2026-08-27 01:36 UTCEG score recompute
  67. 2026-08-27 01:36 UTCGHSA enrichment
  68. 2026-08-26 14:47 UTCEPSS rescore
  69. 2026-08-26 13:56 UTCGHSA enrichment
  70. 2026-08-26 02:16 UTCGHSA enrichment
  71. 2026-08-25 14:35 UTCEG score recompute
  72. 2026-08-25 14:34 UTCGHSA enrichment
  73. 2026-08-25 13:49 UTCEPSS rescore
  74. 2026-08-25 02:53 UTCGHSA enrichment
  75. 2026-08-24 15:13 UTCEG score recompute

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 September 9, 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 67.8% 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.

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