CVE-2026-78239

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-28. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Xiiaozet LK100W exposes a critical management function that can be invoked without authentication, allowing a remote attacker to enable administrative services that should be restricted. Successful exploitation may permit unauthorized access to the device.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

August 27, 2026

Last Modified

August 28, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
Patch available. Sources: cisa.
cisa Patch Available

Xiiaozet LK100W | CISA

https://www.cisa.gov/news-events/ics-advisories/icsa-26-239-01
generic

CSAF/csaf_files/OT/white/2026/icsa-26-239-01.json at develop · cisagov/CSAF · GitHub

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-239-01.json

Vendor Advisories for CVE-2026-78239(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 24× in last 7d / 24× 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 06:00 UTCGHSA enrichment
  2. 2026-08-30 02:15 UTCEG score recompute
  3. 2026-08-30 02:15 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-29 22:31 UTCGHSA enrichment
  6. 2026-08-29 18:47 UTCGHSA enrichment
  7. 2026-08-29 15:00 UTCGHSA enrichment
  8. 2026-08-29 11:15 UTCGHSA enrichment
  9. 2026-08-29 07:27 UTCGHSA enrichment
  10. 2026-08-29 03:40 UTCGHSA enrichment
  11. 2026-08-28 23:52 UTCEG score recompute
  12. 2026-08-28 23:52 UTCGHSA enrichment
  13. 2026-08-28 21:42 UTCEPSS rescore
  14. 2026-08-28 16:39 UTCEG score recompute
  15. 2026-08-28 16:39 UTCGHSA enrichment
  16. 2026-08-28 15:39 UTCEG score recompute
  17. 2026-08-28 15:39 UTCGHSA enrichment
  18. 2026-08-28 11:48 UTCGHSA enrichment
  19. 2026-08-28 08:04 UTCGHSA enrichment
  20. 2026-08-28 04:18 UTCEG score recompute
  21. 2026-08-28 04:18 UTCGHSA enrichment
  22. 2026-08-28 00:31 UTCEG score recompute
  23. 2026-08-27 23:23 UTCEG score recompute
  24. 2026-08-27 23:23 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-78239?
CVE-2026-78239 is a critical vulnerability published on August 27, 2026. Xiiaozet LK100W exposes a critical management function that can be invoked without authentication, allowing a remote attacker to enable administrative services that should be restricted. Successful exploitation may permit unauthorized access to the device.
When was CVE-2026-78239 disclosed?
CVE-2026-78239 was first published in the National Vulnerability Database on August 27, 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-2026-78239 actively exploited?
CVE-2026-78239 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 56.3% of all scored CVEs.
What is the CVSS score of CVE-2026-78239?
CVE-2026-78239 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-78239?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78239, 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

Explore the affected products and dependency analysis for CVE-2026-78239

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