CVE-2026-78609

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-02. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

Incorrect Authorization (CWE-863) in Elastic Cloud on Kubernetes (ECK) can lead to unauthorized modification of data via Metadata Spoofing (CAPEC-690). An actor holding limited Kubernetes permissions confined to a single namespace could cause attacker-controlled certificate material to be included in the Elasticsearch client trust bundle managed by ECK in a separate namespace.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 4, 2026

Advisory Details (1)

Auto-updated Sep 2, 2026
No patch confirmed yet.
generic

Elastic Cloud on Kubernetes 3.5.0 Security Update (ESA-2026-145) - Security Announcements - Discuss the Elastic Stack

https://discuss.elastic.co/t/elastic-cloud-on-kubernetes-3-5-0-security-update-esa-2026-145/390105

Vendor Advisories for CVE-2026-78609(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 20× in last 7d / 60× 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. 2026-09-25 02:12 UTCEG score recompute
  2. 2026-09-25 02:12 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 03:33 UTCEG score recompute
  5. 2026-09-24 03:33 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 04:54 UTCEG score recompute
  8. 2026-09-23 04:54 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 06:15 UTCEG score recompute
  11. 2026-09-22 06:15 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 07:37 UTCGHSA enrichment
  14. 2026-09-20 08:58 UTCEG score recompute
  15. 2026-09-20 08:58 UTCGHSA enrichment
  16. 2026-09-19 10:19 UTCEG score recompute
  17. 2026-09-19 10:19 UTCGHSA enrichment
  18. 2026-09-18 19:28 UTCEPSS rescore
  19. 2026-09-18 11:41 UTCEG score recompute
  20. 2026-09-18 11:41 UTCGHSA enrichment
  21. 2026-09-17 13:02 UTCEG score recompute
  22. 2026-09-17 13:02 UTCGHSA enrichment
  23. 2026-09-16 14:08 UTCEPSS rescore
  24. 2026-09-16 14:05 UTCEG score recompute
  25. 2026-09-16 14:05 UTCGHSA enrichment
Show 35 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 15:26 UTCEG score recompute
  3. 2026-09-15 15:26 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-14 16:47 UTCGHSA enrichment
  7. 2026-09-13 18:08 UTCGHSA enrichment
  8. 2026-09-12 19:29 UTCEG score recompute
  9. 2026-09-12 19:29 UTCGHSA enrichment
  10. 2026-09-11 20:50 UTCEG score recompute
  11. 2026-09-11 20:50 UTCGHSA enrichment
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-10 22:11 UTCEG score recompute
  15. 2026-09-10 22:11 UTCGHSA enrichment
  16. 2026-09-09 23:32 UTCGHSA enrichment
  17. 2026-09-08 23:13 UTCEG score recompute
  18. 2026-09-08 23:13 UTCGHSA enrichment
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-07 14:52 UTCGHSA enrichment
  21. 2026-09-06 14:00 UTCEG score recompute
  22. 2026-09-06 14:00 UTCGHSA enrichment
  23. 2026-09-06 13:48 UTCEPSS rescore
  24. 2026-09-05 15:21 UTCGHSA enrichment
  25. 2026-09-04 16:43 UTCEG score recompute
  26. 2026-09-04 16:43 UTCGHSA enrichment
  27. 2026-09-04 05:07 UTCEPSS rescore
  28. 2026-09-03 18:12 UTCGHSA enrichment
  29. 2026-09-02 19:32 UTCEG score recompute
  30. 2026-09-02 19:32 UTCGHSA enrichment
  31. 2026-09-02 16:20 UTCEG score recompute
  32. 2026-09-02 16:20 UTCGHSA enrichment
  33. 2026-09-02 15:31 UTCEG score recompute
  34. 2026-09-02 14:53 UTCEG score recompute
  35. 2026-09-02 14:51 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78609?
CVE-2026-78609 is a medium vulnerability published on September 2, 2026. Incorrect Authorization (CWE-863) in Elastic Cloud on Kubernetes (ECK) can lead to unauthorized modification of data via Metadata Spoofing (CAPEC-690). An actor holding limited Kubernetes permissions confined to a single namespace could cause attacker-controlled certificate material to be included…
When was CVE-2026-78609 disclosed?
CVE-2026-78609 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78609 actively exploited?
CVE-2026-78609 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 96.5% of all scored CVEs.
What is the CVSS score of CVE-2026-78609?
CVE-2026-78609 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-78609?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78609, 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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