CVE-2026-21662

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory published 2026-07-31. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Unrestricted upload of file with dangerous type vulnerability in Johnson Controls FM Systems Employee allows Using Malicious Files.

This issue affects FM Systems Employee: before 2025.3.1.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 31, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated Sep 28, 2026
Patch available.
generic Patch Available

Security Advisories | Johnson Controls

https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories

Vendor Advisories for CVE-2026-21662(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 19× in last 7d / 129× 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 328 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-21662?
CVE-2026-21662 is a critical vulnerability published on July 31, 2026. Unrestricted upload of file with dangerous type vulnerability in Johnson Controls FM Systems Employee allows Using Malicious Files. This issue affects FM Systems Employee: before 2025.3.1.
When was CVE-2026-21662 disclosed?
CVE-2026-21662 was first published on July 31, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21662 actively exploited?
CVE-2026-21662 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-21662?
CVE-2026-21662 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-21662?
A fix for CVE-2026-21662 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-21662 are linked in the Vendor Advisories panel on this page.

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