CVE-2026-77546

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-2026-77546(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 54× in last 7d / 181× 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 181 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77546?
CVE-2026-77546 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-2026-77546 disclosed?
CVE-2026-77546 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-2026-77546 actively exploited?
CVE-2026-77546 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-2026-77546?
CVE-2026-77546 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-77546?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77546, 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.

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