CVE-2026-77553

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 — 4 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: 0%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 Access Control vulnerability found in UniFi Access Application to escalate privileges 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%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

August 26, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 28, 2026
No patch confirmed yet.
generic
https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 18× 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. 2026-08-30 03:18 UTCEG score recompute
  2. 2026-08-30 03:18 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 23:25 UTCGHSA enrichment
  5. 2026-08-29 19:32 UTCGHSA enrichment
  6. 2026-08-29 15:39 UTCGHSA enrichment
  7. 2026-08-29 11:44 UTCGHSA enrichment
  8. 2026-08-29 07:50 UTCGHSA enrichment
  9. 2026-08-29 03:55 UTCGHSA enrichment
  10. 2026-08-28 23:58 UTCEG score recompute
  11. 2026-08-28 23:58 UTCGHSA enrichment
  12. 2026-08-28 21:42 UTCEPSS rescore
  13. 2026-08-27 15:11 UTCEG score recompute
  14. 2026-08-27 14:25 UTCEPSS rescore
  15. 2026-08-26 15:52 UTCEG score recompute
  16. 2026-08-26 12:58 UTCEG score recompute
  17. 2026-08-26 10:48 UTCEG score recompute
  18. 2026-08-26 10:47 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77553?
CVE-2026-77553 is a critical vulnerability published on August 26, 2026. A malicious actor with access to the network and low privileges could exploit an Improper Access Control vulnerability found in UniFi Access Application to escalate privileges on the host device.
When was CVE-2026-77553 disclosed?
CVE-2026-77553 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-2026-77553 actively exploited?
CVE-2026-77553 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.1% of all scored CVEs.
What is the CVSS score of CVE-2026-77553?
CVE-2026-77553 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-77553?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77553, 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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