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%CVSS: 9.8Exploit: None knownExposed: 0

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

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
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

July 31, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated Sep 14, 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 30× in last 7d / 158× 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 282 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 79.2% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21662, 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

Explore the affected products and dependency analysis for CVE-2026-21662

Explore →

Is Your Infrastructure Affected by CVE-2026-21662?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs