CVE-2026-18556

CRITICALNVD 7.49.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-08-04), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.4 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: 0%CVSS: 7.4Exploit: cisa kev · ssvc activeExposed: 0

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

Authentication bypass using an alternate path or channel vulnerability in N-able N-central allows Authentication Bypass.

This issue affects N-central: through 2026.1.

CVSS v3
7.4
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
0%
EPSS %ILE
40%
KEV
⚠ Exploited

Published

August 1, 2026

Last Modified

August 5, 2026

Advisory Details (1)

Auto-updated Aug 1, 2026
No patch confirmed yet.
generic

Status Dashboard

https://uptime.n-able.com/

Vendor Advisories for CVE-2026-18556(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 61× in last 7d / 169× 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 169 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2026-18556?
CVE-2026-18556 is a critical vulnerability published on August 1, 2026. Authentication bypass using an alternate path or channel vulnerability in N-able N-central allows Authentication Bypass. This issue affects N-central: through 2026.1.
When was CVE-2026-18556 disclosed?
CVE-2026-18556 was first published in the National Vulnerability Database on August 1, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18556 actively exploited?
Yes. CISA added CVE-2026-18556 to the Known Exploited Vulnerabilities catalog on August 4, 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-2026-18556?
CVE-2026-18556 has a CVSS v3 base score of 7.4 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-18556?
CVE-2026-18556 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-2026-18556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18556, 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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