CVE-2026-18759

HIGHPre-NVD 8.58.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (5th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.5Exploit: None knownExposed services: Not assessed

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

The background service of ABP or AES runs as NT AUTHORITY\SYSTEM and implements a file-based inter-process communication (IPC) mechanism protected by AES encryption. Because the encryption key file is readable by standard users and protected using DPAPI. Any authenticated local user can recover the key and forge valid IPC requests. Furthermore, the service does not check the identity of the requesting process and validates destination paths using an insufficient substring check. A local attacker can submit crafted encrypted requests containing directory traversal sequences to perform arbitrary file reads and arbitrary file writes as NT AUTHORITY\SYSTEM, leading to full local privilege escalation. Affected products and versions include: ABP (ASUSTOR Backup Plan) 2.0.7.10171 and earlier as well as AES (ASUSTOR EZSync) 1.1.1.3113 and earlier.

CVSS v3
8.5
EG Score
8.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA 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
Severity85% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (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 4, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

AS-2026-021: ABP and AES | ASUSTOR NAS

https://www.asustor.com/security/security_advisory_detail?id=70

Vendor Advisories for CVE-2026-18759(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 81× 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 208 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-18759?
CVE-2026-18759 is a high vulnerability published on August 4, 2026. The background service of ABP or AES runs as NT AUTHORITY\SYSTEM and implements a file-based inter-process communication (IPC) mechanism protected by AES encryption. Because the encryption key file is readable by standard users and protected using DPAPI. Any authenticated local user can recover the…
When was CVE-2026-18759 disclosed?
CVE-2026-18759 was first published on August 4, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18759 actively exploited?
CVE-2026-18759 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18759?
CVE-2026-18759 has a CVSS base score of 8.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18759?
No fix for CVE-2026-18759 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-2026-18759 are linked in the Vendor Advisories panel on this page.

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