CVE-2026-18509

HIGHNVD 7.18.2▲
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-13. NVD baseline CVSS 7.1; sources differ by 1.1.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

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

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to gain privilege escalation via the Navigator for i debugger. This could allow the attacker to access or manipulate sensitive data on the system, or create new profiles with elevated privileges on the IBM i system.

CVSS v3
7.1
EG Score
8.2(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 17, 2026

Advisory Details (1)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic

Security Bulletin: IBM i is Affected By A Prvilege Escalation Vulnerability [CVE-2026-18509]

https://www.ibm.com/support/pages/node/7283279

Vendor Advisories for CVE-2026-18509(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 22× in last 7d / 103× 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 143 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18509?
CVE-2026-18509 is a high vulnerability published on August 13, 2026. IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to gain privilege escalation via the Navigator for i debugger. This could allow the attacker to access or manipulate sensitive data on the system, or create new profiles with elevated privileges on the IBM i system.
When was CVE-2026-18509 disclosed?
CVE-2026-18509 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18509 actively exploited?
CVE-2026-18509 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 93.9% of all scored CVEs.
What is the CVSS score of CVE-2026-18509?
CVE-2026-18509 has a CVSS v3 base score of 7.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.2.
How do I remediate CVE-2026-18509?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18509, 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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