CVE-2026-18577

CRITICALNVD 8.19.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-08-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.1 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 54%CVSS: 8.1Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 0

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

An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1

CVSS v3
8.1
EG Score
9.0(high)
EG Risk
96(Act)
EG Risk 96/100SSVC: Act

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
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
54%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

August 2, 2026

Last Modified

August 4, 2026

Advisory Details (2)

Auto-updated Aug 2, 2026
No patch confirmed yet.
generic
https://www.cve.org/CVERecord?id=CVE-2026-18556
generic

2026.3 HF1 Release Notes

https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm

Vendor Advisories for CVE-2026-18577(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 52× in last 7d / 235× 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 396 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-18577.yaml
    First seen Jan 1, 2026

    N-able N-central < 2026.3.1.10 - Authentication Bypass

    Open source ↗

Frequently asked(6)

What is CVE-2026-18577?
CVE-2026-18577 is a critical vulnerability published on August 2, 2026. An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1
When was CVE-2026-18577 disclosed?
CVE-2026-18577 was first published in the National Vulnerability Database on August 2, 2026, with the most recent update on August 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18577 actively exploited?
Yes. CISA added CVE-2026-18577 to the Known Exploited Vulnerabilities catalog on August 3, 2026, affecting N-able N-central. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-18577?
CVE-2026-18577 has a CVSS v3 base score of 8.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-18577?
CVE-2026-18577 affects N-able N-central. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-18577?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18577, 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-2026-18577

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