CVE-2026-54402

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-02. a secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.9Exploit: 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 low privileges could exploit an Improper Input Validation vulnerability found in UniFi OS to execute a Command Injection on the host device.

CVSS v3
9.9
EG Score
9.9(high)
EPSS
51.8%
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-2026-54402(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 62× in last 7d / 62× 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 04:42 UTCEG score recompute
  2. 2026-07-07 04:42 UTCGHSA enrichment
  3. 2026-07-07 00:33 UTCEG score recompute
  4. 2026-07-07 00:33 UTCGHSA enrichment
  5. 2026-07-06 20:23 UTCEG score recompute
  6. 2026-07-06 20:23 UTCGHSA enrichment
  7. 2026-07-06 16:27 UTCEPSS rescore
  8. 2026-07-06 16:27 UTCEPSS rescore
  9. 2026-07-06 16:12 UTCEG score recompute
  10. 2026-07-06 16:12 UTCGHSA enrichment
  11. 2026-07-06 12:03 UTCEG score recompute
  12. 2026-07-06 12:02 UTCGHSA enrichment
  13. 2026-07-06 07:52 UTCEG score recompute
  14. 2026-07-06 07:52 UTCGHSA enrichment
  15. 2026-07-06 03:41 UTCEG score recompute
  16. 2026-07-06 03:41 UTCGHSA enrichment
  17. 2026-07-06 02:23 UTCEPSS rescore
  18. 2026-07-06 02:23 UTCEPSS rescore
  19. 2026-07-05 23:32 UTCEG score recompute
  20. 2026-07-05 23:31 UTCGHSA enrichment
  21. 2026-07-05 19:22 UTCEG score recompute
  22. 2026-07-05 19:22 UTCGHSA enrichment
  23. 2026-07-05 15:11 UTCEG score recompute
  24. 2026-07-05 15:11 UTCGHSA enrichment
  25. 2026-07-05 11:02 UTCEG score recompute
Show 37 more
  1. 2026-07-05 11:02 UTCGHSA enrichment
  2. 2026-07-05 06:52 UTCEG score recompute
  3. 2026-07-05 06:52 UTCGHSA enrichment
  4. 2026-07-05 02:41 UTCEG score recompute
  5. 2026-07-05 02:41 UTCGHSA enrichment
  6. 2026-07-05 02:31 UTCEPSS rescore
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 22:32 UTCEG score recompute
  9. 2026-07-04 22:32 UTCGHSA enrichment
  10. 2026-07-04 18:21 UTCEG score recompute
  11. 2026-07-04 18:21 UTCGHSA enrichment
  12. 2026-07-04 14:10 UTCEG score recompute
  13. 2026-07-04 14:10 UTCGHSA enrichment
  14. 2026-07-04 10:00 UTCEG score recompute
  15. 2026-07-04 10:00 UTCGHSA enrichment
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-04 05:51 UTCEG score recompute
  19. 2026-07-04 05:51 UTCGHSA enrichment
  20. 2026-07-04 01:41 UTCEG score recompute
  21. 2026-07-04 01:41 UTCGHSA enrichment
  22. 2026-07-03 21:31 UTCEG score recompute
  23. 2026-07-03 21:31 UTCGHSA enrichment
  24. 2026-07-03 17:22 UTCEG score recompute
  25. 2026-07-03 17:22 UTCGHSA enrichment
  26. 2026-07-03 13:12 UTCEG score recompute
  27. 2026-07-03 13:12 UTCGHSA enrichment
  28. 2026-07-03 09:02 UTCEG score recompute
  29. 2026-07-03 09:02 UTCGHSA enrichment
  30. 2026-07-03 04:52 UTCEG score recompute
  31. 2026-07-03 04:52 UTCGHSA enrichment
  32. 2026-07-03 00:42 UTCEG score recompute
  33. 2026-07-03 00:42 UTCGHSA enrichment
  34. 2026-07-02 20:33 UTCEG score recompute
  35. 2026-07-02 20:32 UTCGHSA enrichment
  36. 2026-07-02 16:23 UTCEG score recompute
  37. 2026-07-02 16:23 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. 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 51.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54402?
CVE-2026-54402 has a CVSS v3 base score of 9.9 (NVD).
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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