CVE-2026-6388

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-16. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

A flaw was found in ArgoCD Image Updater. This vulnerability allows an attacker, with permissions to create or modify an ImageUpdater resource in a multi-tenant environment, to bypass namespace boundaries. By exploiting insufficient validation, the attacker can trigger unauthorized image updates on applications managed by other tenants. This leads to cross-namespace privilege escalation, impacting application integrity through unauthorized application updates.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

April 15, 2026

Last Modified

July 15, 2026

Advisory Details (3)

Auto-updated Sep 7, 2026
Patch available. Sources: redhat.
redhat
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6388.json
redhat

2458766 – (CVE-2026-6388) CVE-2026-6388 argocd-image-updater: ArgoCD Image Updater: Cross-Namespace Privilege Escalation via insufficient namespace validation

https://bugzilla.redhat.com/show_bug.cgi?id=2458766
redhat Patch Available

CVE-2026-6388 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-6388

Vendor Advisories for CVE-2026-6388(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 5× in last 7d / 27× 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 231 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-6388?
CVE-2026-6388 is a critical vulnerability published on April 15, 2026. A flaw was found in ArgoCD Image Updater. This vulnerability allows an attacker, with permissions to create or modify an ImageUpdater resource in a multi-tenant environment, to bypass namespace boundaries. By exploiting insufficient validation, the attacker can trigger unauthorized image updates on…
When was CVE-2026-6388 disclosed?
CVE-2026-6388 was first published in the National Vulnerability Database on April 15, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6388 actively exploited?
CVE-2026-6388 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 71.0% of all scored CVEs.
What is the CVSS score of CVE-2026-6388?
CVE-2026-6388 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-6388?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6388, 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.

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