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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.8Exploit: Elevated riskExposed services: Not assessed

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

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
8.8HIGHmedium confidence
EG Risk
56
EG Risk 56/100CISA SSVC

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%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
36th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 13, 2026

Last Modified

September 30, 2026

Advisory Details (2)

Auto-updated Aug 13, 2026
🔬 Proof of concept available. No fix on record yet. 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
githubMentions a patch (unverified)🟡 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 16× in last 7d / 91× 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 205 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 22:58 UTCEG score recompute
  5. 2026-10-06 22:58 UTCGHSA enrichment
  6. 2026-10-06 15:18 UTCEPSS rescore
  7. 2026-10-06 09:25 UTCEG score recompute
  8. 2026-10-06 09:25 UTCGHSA enrichment
  9. 2026-10-05 17:43 UTCEPSS rescore
  10. 2026-10-05 14:35 UTCEG score recompute
  11. 2026-10-05 14:35 UTCGHSA enrichment
  12. 2026-10-04 23:22 UTCEPSS rescore
  13. 2026-10-04 22:15 UTCGHSA enrichment
  14. 2026-10-04 07:24 UTCGHSA enrichment
  15. 2026-10-03 19:44 UTCEG score recompute
  16. 2026-10-03 19:44 UTCGHSA enrichment
  17. 2026-10-03 14:26 UTCEPSS rescore
  18. 2026-10-02 19:09 UTCEG score recompute
  19. 2026-10-02 19:09 UTCGHSA enrichment
  20. 2026-10-02 07:26 UTCEG score recompute
  21. 2026-10-02 07:26 UTCGHSA enrichment
  22. 2026-10-01 19:50 UTCEPSS rescore
  23. 2026-10-01 06:23 UTCGHSA enrichment
  24. 2026-09-30 18:43 UTCEG score recompute
  25. 2026-09-30 18:43 UTCGHSA enrichment
Show 75 more
  1. 2026-09-30 17:39 UTCEG score recompute
  2. 2026-09-30 17:39 UTCGHSA enrichment
  3. 2026-09-29 03:24 UTCEG score recompute
  4. 2026-09-29 03:24 UTCGHSA enrichment
  5. 2026-09-28 13:52 UTCEPSS rescore
  6. 2026-09-28 12:13 UTCGHSA enrichment
  7. 2026-09-28 00:33 UTCEG score recompute
  8. 2026-09-28 00:33 UTCGHSA enrichment
  9. 2026-09-27 13:48 UTCEPSS rescore
  10. 2026-09-27 09:40 UTCEG score recompute
  11. 2026-09-27 09:40 UTCGHSA enrichment
  12. 2026-09-26 15:59 UTCEPSS rescore
  13. 2026-09-25 03:25 UTCEG score recompute
  14. 2026-09-25 03:25 UTCGHSA enrichment
  15. 2026-09-24 11:12 UTCGHSA enrichment
  16. 2026-09-23 23:32 UTCEG score recompute
  17. 2026-09-23 23:32 UTCGHSA enrichment
  18. 2026-09-23 17:54 UTCEPSS rescore
  19. 2026-09-23 11:29 UTCGHSA enrichment
  20. 2026-09-22 23:49 UTCEG score recompute
  21. 2026-09-22 23:49 UTCGHSA enrichment
  22. 2026-09-22 11:42 UTCGHSA enrichment
  23. 2026-09-22 00:00 UTCEG score recompute
  24. 2026-09-22 00:00 UTCGHSA enrichment
  25. 2026-09-21 21:09 UTCEPSS rescore
  26. 2026-09-21 12:15 UTCGHSA enrichment
  27. 2026-09-21 00:29 UTCEG score recompute
  28. 2026-09-21 00:29 UTCGHSA enrichment
  29. 2026-09-20 20:16 UTCEPSS rescore
  30. 2026-09-20 12:43 UTCGHSA enrichment
  31. 2026-09-19 23:54 UTCEG score recompute
  32. 2026-09-19 23:54 UTCGHSA enrichment
  33. 2026-09-19 12:13 UTCGHSA enrichment
  34. 2026-09-19 00:32 UTCEG score recompute
  35. 2026-09-19 00:32 UTCGHSA enrichment
  36. 2026-09-18 19:28 UTCEPSS rescore
  37. 2026-09-18 12:48 UTCGHSA enrichment
  38. 2026-09-18 00:24 UTCEG score recompute
  39. 2026-09-18 00:24 UTCGHSA enrichment
  40. 2026-09-17 11:59 UTCGHSA enrichment
  41. 2026-09-16 23:51 UTCEG score recompute
  42. 2026-09-16 23:51 UTCGHSA enrichment
  43. 2026-09-16 14:08 UTCEPSS rescore
  44. 2026-09-16 10:28 UTCEG score recompute
  45. 2026-09-16 10:28 UTCGHSA enrichment
  46. 2026-09-16 05:15 UTCEPSS rescore
  47. 2026-09-15 20:10 UTCGHSA enrichment
  48. 2026-09-15 08:30 UTCEG score recompute
  49. 2026-09-15 08:30 UTCGHSA enrichment
  50. 2026-09-15 03:12 UTCEPSS rescore
  51. 2026-09-14 20:45 UTCGHSA enrichment
  52. 2026-09-14 06:17 UTCGHSA enrichment
  53. 2026-09-13 18:36 UTCEG score recompute
  54. 2026-09-13 18:36 UTCGHSA enrichment
  55. 2026-09-13 06:56 UTCEG score recompute
  56. 2026-09-13 06:56 UTCGHSA enrichment
  57. 2026-09-12 19:03 UTCEG score recompute
  58. 2026-09-12 19:03 UTCGHSA enrichment
  59. 2026-09-12 15:02 UTCEPSS rescore
  60. 2026-09-12 07:22 UTCGHSA enrichment
  61. 2026-09-11 19:42 UTCEG score recompute
  62. 2026-09-11 19:42 UTCGHSA enrichment
  63. 2026-09-11 14:53 UTCEPSS rescore
  64. 2026-09-11 08:01 UTCGHSA enrichment
  65. 2026-09-10 20:20 UTCEG score recompute
  66. 2026-09-10 20:20 UTCGHSA enrichment
  67. 2026-09-10 09:35 UTCEPSS rescore
  68. 2026-09-10 08:40 UTCGHSA enrichment
  69. 2026-09-09 20:50 UTCGHSA enrichment
  70. 2026-09-09 17:41 UTCGHSA enrichment
  71. 2026-09-09 04:52 UTCEG score recompute
  72. 2026-09-09 04:51 UTCGHSA enrichment
  73. 2026-09-08 22:01 UTCEPSS rescore
  74. 2026-09-08 04:07 UTCGHSA enrichment
  75. 2026-09-07 16:27 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 on August 13, 2026, with the most recent update on September 30, 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 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-72840?
CVE-2026-72840 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-72840?
No fix for CVE-2026-72840 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-72840 are linked in the Vendor Advisories panel on this page.

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