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 — 4 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 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 05:32 UTCEG score recompute
  2. 2026-08-21 05:32 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 17:01 UTCGHSA enrichment
  5. 2026-08-20 04:31 UTCEG score recompute
  6. 2026-08-20 04:31 UTCGHSA enrichment
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-19 16:00 UTCGHSA enrichment
  9. 2026-08-19 03:30 UTCGHSA enrichment
  10. 2026-08-18 14:59 UTCEG score recompute
  11. 2026-08-18 14:59 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 02:29 UTCGHSA enrichment
  14. 2026-08-17 13:59 UTCEG score recompute
  15. 2026-08-17 13:59 UTCGHSA enrichment
  16. 2026-08-17 13:58 UTCNVD updateCVSS v3 → 7.1
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-17 06:32 UTCGHSA enrichment
  19. 2026-08-16 17:50 UTCEG score recompute
  20. 2026-08-16 17:50 UTCGHSA enrichment
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 05:19 UTCEG score recompute
  23. 2026-08-16 05:19 UTCGHSA enrichment
  24. 2026-08-16 02:14 UTCEPSS rescore
  25. 2026-08-15 16:50 UTCGHSA enrichment
Show 15 more
  1. 2026-08-15 04:20 UTCEG score recompute
  2. 2026-08-15 04:20 UTCGHSA enrichment
  3. 2026-08-15 04:13 UTCEG score recompute
  4. 2026-08-15 04:13 UTCGHSA enrichment
  5. 2026-08-15 01:30 UTCEPSS rescore
  6. 2026-08-14 19:17 UTCGHSA enrichment
  7. 2026-08-14 16:32 UTCEG score recompute
  8. 2026-08-14 16:32 UTCGHSA enrichment
  9. 2026-08-14 16:04 UTCEG score recompute
  10. 2026-08-14 16:04 UTCGHSA enrichment
  11. 2026-08-14 09:51 UTCEG score recompute
  12. 2026-08-14 09:51 UTCGHSA enrichment
  13. 2026-08-13 21:21 UTCEG score recompute
  14. 2026-08-13 20:57 UTCEG score recompute
  15. 2026-08-13 20:56 UTCMITRE cvelistV5first tracked

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 93.8% 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

Explore the affected products and dependency analysis for CVE-2026-18509

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