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 — 3 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
45%
KEV
Not listed

Published

August 27, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Sep 14, 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 55× in last 7d / 198× 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 198 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 31, 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 55.0% 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.

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