CVE-2026-77547

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-28. 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
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.9Exploit: 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 Access Application to execute a Command Injection on the host device.

CVSS v3
9.9
EG Score
9.9(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
55%
KEV
Not listed

Published

August 26, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Sep 18, 2026
No patch confirmed yet.
generic
https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9

Vendor Advisories for CVE-2026-77547(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 53× in last 7d / 178× 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 178 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77547?
CVE-2026-77547 is a critical vulnerability published on August 26, 2026. A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi Access Application to execute a Command Injection on the host device.
When was CVE-2026-77547 disclosed?
CVE-2026-77547 was first published in the National Vulnerability Database on August 26, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77547 actively exploited?
CVE-2026-77547 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 44.8% of all scored CVEs.
What is the CVSS score of CVE-2026-77547?
CVE-2026-77547 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-77547?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77547, 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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