CVE-2026-54400

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-02. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: 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 high privileges could exploit an Improper Access Control vulnerability found in UniFi Access Application to escalate privileges on the host device.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

July 2, 2026

Last Modified

August 17, 2026

Advisory Details (1)

Auto-updated Sep 7, 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-2026-54400(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 10× in last 7d / 122× 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 400 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 00:17 UTCGHSA enrichment
  16. 2026-08-30 20:36 UTCEG score recompute
  17. 2026-08-30 20:36 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 13:45 UTCGHSA enrichment
  6. 2026-08-25 04:27 UTCGHSA enrichment
  7. 2026-08-25 00:42 UTCGHSA enrichment
  8. 2026-08-24 20:56 UTCEG score recompute
  9. 2026-08-24 20:56 UTCGHSA enrichment
  10. 2026-08-24 13:59 UTCGHSA enrichment
  11. 2026-08-24 10:19 UTCEG score recompute
  12. 2026-08-24 10:19 UTCGHSA enrichment
  13. 2026-08-24 04:52 UTCGHSA enrichment
  14. 2026-08-24 01:11 UTCGHSA enrichment
  15. 2026-08-23 21:30 UTCGHSA enrichment
  16. 2026-08-23 17:50 UTCGHSA enrichment
  17. 2026-08-23 14:09 UTCGHSA enrichment
  18. 2026-08-23 10:26 UTCGHSA enrichment
  19. 2026-08-23 06:36 UTCGHSA enrichment
  20. 2026-08-23 02:53 UTCEG score recompute
  21. 2026-08-23 02:53 UTCGHSA enrichment
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-22 23:09 UTCGHSA enrichment
  24. 2026-08-22 19:28 UTCGHSA enrichment
  25. 2026-08-22 13:53 UTCGHSA enrichment
  26. 2026-08-22 10:12 UTCGHSA enrichment
  27. 2026-08-22 06:30 UTCEG score recompute
  28. 2026-08-22 06:30 UTCGHSA enrichment
  29. 2026-08-21 23:49 UTCEPSS rescore
  30. 2026-08-21 22:53 UTCGHSA enrichment
  31. 2026-08-21 19:13 UTCGHSA enrichment
  32. 2026-08-21 15:32 UTCGHSA enrichment
  33. 2026-08-21 11:51 UTCGHSA enrichment
  34. 2026-08-21 08:08 UTCGHSA enrichment
  35. 2026-08-21 04:28 UTCGHSA enrichment
  36. 2026-08-20 23:13 UTCEG score recompute
  37. 2026-08-20 23:13 UTCGHSA enrichment
  38. 2026-08-20 22:55 UTCEPSS rescore
  39. 2026-08-20 19:33 UTCGHSA enrichment
  40. 2026-08-20 15:52 UTCGHSA enrichment
  41. 2026-08-20 11:35 UTCGHSA enrichment
  42. 2026-08-20 07:54 UTCGHSA enrichment
  43. 2026-08-20 04:14 UTCEG score recompute
  44. 2026-08-20 04:14 UTCGHSA enrichment
  45. 2026-08-19 17:04 UTCEPSS rescore
  46. 2026-08-19 16:29 UTCGHSA enrichment
  47. 2026-08-19 12:32 UTCGHSA enrichment
  48. 2026-08-19 08:27 UTCGHSA enrichment
  49. 2026-08-19 04:46 UTCGHSA enrichment
  50. 2026-08-19 00:57 UTCGHSA enrichment
  51. 2026-08-18 20:55 UTCEG score recompute
  52. 2026-08-18 20:55 UTCGHSA enrichment
  53. 2026-08-18 13:48 UTCEPSS rescore
  54. 2026-08-18 11:49 UTCGHSA enrichment
  55. 2026-08-18 04:31 UTCGHSA enrichment
  56. 2026-08-17 22:52 UTCGHSA enrichment
  57. 2026-08-17 15:22 UTCEG score recompute
  58. 2026-08-17 15:22 UTCGHSA enrichment
  59. 2026-08-17 13:47 UTCEPSS rescore
  60. 2026-08-17 11:48 UTCGHSA enrichment
  61. 2026-08-17 07:59 UTCGHSA enrichment
  62. 2026-08-17 04:19 UTCGHSA enrichment
  63. 2026-08-17 00:38 UTCGHSA enrichment
  64. 2026-08-16 20:57 UTCGHSA enrichment
  65. 2026-08-16 17:16 UTCEG score recompute
  66. 2026-08-16 17:16 UTCGHSA enrichment
  67. 2026-08-16 14:56 UTCEPSS rescore
  68. 2026-08-16 13:35 UTCGHSA enrichment
  69. 2026-08-16 09:54 UTCGHSA enrichment
  70. 2026-08-16 06:14 UTCGHSA enrichment
  71. 2026-08-16 02:34 UTCEG score recompute
  72. 2026-08-16 02:34 UTCGHSA enrichment
  73. 2026-08-16 02:14 UTCEPSS rescore
  74. 2026-08-15 22:54 UTCGHSA enrichment
  75. 2026-08-15 19:13 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-54400?
CVE-2026-54400 is a critical vulnerability published on July 2, 2026. A malicious actor with access to the network and high privileges could exploit an Improper Access Control vulnerability found in UniFi Access Application to escalate privileges on the host device.
When was CVE-2026-54400 disclosed?
CVE-2026-54400 was first published in the National Vulnerability Database on July 2, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54400 actively exploited?
CVE-2026-54400 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.1% of all scored CVEs.
What is the CVSS score of CVE-2026-54400?
CVE-2026-54400 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-54400?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54400, 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-2026-54400

Explore →

Is Your Infrastructure Affected by CVE-2026-54400?

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

Start Free Scan →Browse All CVEs