CVE-2026-18556

Analyzed
Published: 01 Aug 2026, 19:59
Last modified:05 Aug 2026, 03:56

Vulnerability Summary

Overall Risk (default)
medium
33/100
CVSS Score
8.2 HIGH
v4.0 (cve.org)
EPSS Score
0.49% LOW
0% probability 0.00%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

01 Aug 2026, 19:59
Published
Vulnerability first disclosed
04 Aug 2026, 00:00
Added to CISA KEV
N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability
05 Aug 2026, 03:56
Last Modified
Vulnerability information updated
07 Aug 2026, 00:00
CISA Remediation Due
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Description

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 Metrics

  • v4.0•HIGH•Score: 8.2CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  • v4.0•HIGH•Score: 8.2CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • v3.1•HIGH•Score: 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Trends

Current EPSS score: 0.49%• Percentile: 40%

Techniques & Countermeasures

  • CWE-288•Authentication Bypass Using an Alternate Path or Channel

    The product requires authentication, but the product has an alternate path or channel that does not require authentication.

Affected Systems

  • n-able•n-central

    ≤ 2026.1

References (3)