CVE-2026-54402

CRITICALNVD 8.89.9▲
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-02. NVD baseline CVSS 8.8; sources differ by 1.1.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.8Exploit: None knownExposed: 0

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

A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi OS to execute a Command Injection on the host device.

CVSS v3
8.8
EG Score
9.9(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity99% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
77%
KEV
Not listed

Published

July 2, 2026

Last Modified

July 10, 2026

Advisory Details (1)

Auto-updated Jul 9, 2026
No patch confirmed yet.
generic
https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc

Vendor Advisories for CVE-2026-54402(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 116× 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 371 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-54402?
CVE-2026-54402 is a critical vulnerability published on July 2, 2026. A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi OS to execute a Command Injection on the host device.
When was CVE-2026-54402 disclosed?
CVE-2026-54402 was first published in the National Vulnerability Database on July 2, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54402 actively exploited?
CVE-2026-54402 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 23.3% of all scored CVEs.
What is the CVSS score of CVE-2026-54402?
CVE-2026-54402 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.9.
How do I remediate CVE-2026-54402?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54402, 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

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