CVE-2026-28205

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-09. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

OpenPLC_V3 is vulnerable to an Initialization of a Resource with an Insecure Default vulnerability which could allow an attacker to gain access to the system by bypassing authentication via an API.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

April 9, 2026

Last Modified

April 28, 2026

Advisory Details (1)

Auto-updated Sep 9, 2026
Patch available. Sources: cisa.
cisa Patch Available

OpenPLC_V3 (Update A) | CISA

https://www.cisa.gov/news-events/ics-advisories/icsa-25-345-10

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 28× 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 245 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-28205?
CVE-2026-28205 is a critical vulnerability published on April 9, 2026. OpenPLC_V3 is vulnerable to an Initialization of a Resource with an Insecure Default vulnerability which could allow an attacker to gain access to the system by bypassing authentication via an API.
When was CVE-2026-28205 disclosed?
CVE-2026-28205 was first published in the National Vulnerability Database on April 9, 2026, with the most recent update on April 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28205 actively exploited?
CVE-2026-28205 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 62.0% of all scored CVEs.
What is the CVSS score of CVE-2026-28205?
CVE-2026-28205 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-28205?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28205, 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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