CVE-2026-5387

CRITICALNVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 68% of all CVEs by exploit prediction. 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, nvd
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: None knownExposed: 0

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

The vulnerability, if exploited, could allow an unauthenticated miscreant to perform operations intended only for Simulator Instructor or Simulator Developer (Administrator) roles, resulting in privilege escalation with potential for modification of simulation parameters, training configuration, and training records.

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
57(Track)
EG Risk 57/100SSVC: 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
Severity93% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

April 15, 2026

Last Modified

April 17, 2026

Advisory Details (4)

Auto-updated Sep 6, 2026
Patch available. Sources: cisa.
cisa Patch Available

AVEVA Pipeline Simulation | CISA

https://www.cisa.gov/news-events/ics-advisories/icsa-26-106-04
generic
https://www.aveva.com/content/dam/aveva/documents/support/cyber-security-updates/SecurityBulletin_AVEVA-2026-004.pdf
generic

AVEVA | Customer Support Portal

https://softwaresupportsp.aveva.com/en-US/downloads/products/details/57b79fdb-7b5f-4125-8a44-833b6b5c6d6f
generic

CSAF/csaf_files/OT/white/2026/icsa-26-106-04.json at develop · cisagov/CSAF · GitHub

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-106-04.json

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 25× 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 229 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-5387?
CVE-2026-5387 is a critical vulnerability published on April 15, 2026. The vulnerability, if exploited, could allow an unauthenticated miscreant to perform operations intended only for Simulator Instructor or Simulator Developer (Administrator) roles, resulting in privilege escalation with potential for modification of simulation parameters, training configuration,…
When was CVE-2026-5387 disclosed?
CVE-2026-5387 was first published in the National Vulnerability Database on April 15, 2026, with the most recent update on April 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5387 actively exploited?
CVE-2026-5387 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 67.7% of all scored CVEs.
What is the CVSS score of CVE-2026-5387?
CVE-2026-5387 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-5387?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5387, 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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