CVE-2026-54400

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH 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
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 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(high)
EPSS
17.0%
KEV
Not listed

Published

July 2, 2026

Last Modified

July 2, 2026

Advisory Details (1)

Auto-updated Jul 2, 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 70× in last 7d / 70× 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.

  1. 2026-07-07 06:56 UTCEG score recompute
  2. 2026-07-07 06:56 UTCGHSA enrichment
  3. 2026-07-07 03:15 UTCEG score recompute
  4. 2026-07-07 03:15 UTCGHSA enrichment
  5. 2026-07-06 23:35 UTCEG score recompute
  6. 2026-07-06 23:35 UTCGHSA enrichment
  7. 2026-07-06 19:54 UTCEG score recompute
  8. 2026-07-06 19:54 UTCGHSA enrichment
  9. 2026-07-06 16:27 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 16:13 UTCEG score recompute
  12. 2026-07-06 16:12 UTCGHSA enrichment
  13. 2026-07-06 12:32 UTCEG score recompute
  14. 2026-07-06 12:32 UTCGHSA enrichment
  15. 2026-07-06 08:52 UTCEG score recompute
  16. 2026-07-06 08:51 UTCGHSA enrichment
  17. 2026-07-06 05:09 UTCEG score recompute
  18. 2026-07-06 05:09 UTCGHSA enrichment
  19. 2026-07-06 02:23 UTCEPSS rescore
  20. 2026-07-06 02:23 UTCEPSS rescore
  21. 2026-07-06 01:28 UTCEG score recompute
  22. 2026-07-06 01:28 UTCGHSA enrichment
  23. 2026-07-05 21:47 UTCEG score recompute
  24. 2026-07-05 21:47 UTCGHSA enrichment
  25. 2026-07-05 18:06 UTCEG score recompute
Show 45 more
  1. 2026-07-05 18:06 UTCGHSA enrichment
  2. 2026-07-05 14:25 UTCEG score recompute
  3. 2026-07-05 14:25 UTCGHSA enrichment
  4. 2026-07-05 10:44 UTCEG score recompute
  5. 2026-07-05 10:44 UTCGHSA enrichment
  6. 2026-07-05 07:04 UTCEG score recompute
  7. 2026-07-05 07:03 UTCGHSA enrichment
  8. 2026-07-05 03:22 UTCEG score recompute
  9. 2026-07-05 03:21 UTCGHSA enrichment
  10. 2026-07-05 02:31 UTCEPSS rescore
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-04 23:41 UTCEG score recompute
  13. 2026-07-04 23:40 UTCGHSA enrichment
  14. 2026-07-04 19:59 UTCEG score recompute
  15. 2026-07-04 19:59 UTCGHSA enrichment
  16. 2026-07-04 16:19 UTCEG score recompute
  17. 2026-07-04 16:19 UTCGHSA enrichment
  18. 2026-07-04 12:37 UTCEG score recompute
  19. 2026-07-04 12:37 UTCGHSA enrichment
  20. 2026-07-04 08:56 UTCEG score recompute
  21. 2026-07-04 08:56 UTCGHSA enrichment
  22. 2026-07-04 06:31 UTCEPSS rescore
  23. 2026-07-04 06:31 UTCEPSS rescore
  24. 2026-07-04 05:15 UTCEG score recompute
  25. 2026-07-04 05:15 UTCGHSA enrichment
  26. 2026-07-04 01:34 UTCEG score recompute
  27. 2026-07-04 01:33 UTCGHSA enrichment
  28. 2026-07-03 21:51 UTCEG score recompute
  29. 2026-07-03 21:51 UTCGHSA enrichment
  30. 2026-07-03 18:11 UTCEG score recompute
  31. 2026-07-03 18:11 UTCGHSA enrichment
  32. 2026-07-03 14:30 UTCEG score recompute
  33. 2026-07-03 14:30 UTCGHSA enrichment
  34. 2026-07-03 10:49 UTCEG score recompute
  35. 2026-07-03 10:49 UTCGHSA enrichment
  36. 2026-07-03 07:06 UTCEG score recompute
  37. 2026-07-03 07:06 UTCGHSA enrichment
  38. 2026-07-03 03:25 UTCEG score recompute
  39. 2026-07-03 03:25 UTCGHSA enrichment
  40. 2026-07-02 23:45 UTCEG score recompute
  41. 2026-07-02 23:45 UTCGHSA enrichment
  42. 2026-07-02 20:04 UTCEG score recompute
  43. 2026-07-02 20:04 UTCGHSA enrichment
  44. 2026-07-02 16:24 UTCEG score recompute
  45. 2026-07-02 16:24 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. 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 17.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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

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