// CVE

CVE-2026-18556

High 8.2 Exploited (KEV)

N-able N-central

8.2CVSS

8%EPSS

YesCISA KEV

Summary

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.

Published: 2026-08-01 · In KEV since: 2026-08-04

Analysis

🔴 Critical — actively exploited

Weakness: CWE-288.

How it's exploited: Exploitable over the network (internet-reachable), unauthenticated, no user interaction, with high complexity.

Impact: Confidentiality high · Integrity none · Availability none.

Status: Active exploitation confirmed by CISA (KEV).

How to defend:

Patch now: it is in CISA's actively-exploited catalog (KEV), with a deadline.
Reduce exposure: keep it off the internet; firewall, VPN or network segmentation.
Detect: turn this CVE into detection rules.

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

The vector encodes how it's exploited (translated above, in the analysis). Break it down in the CVSS tool →

🔗 NVD record CISA KEV 🌉 CVE → detection 🎯 Am I exposed? ⚖️ Prioritize patch

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Sources: CISA KEV · EPSS · FIRST.org · NVD. Analysis derived from the CVSS vector and exploitation status (no AI). Informational; always verify against the vendor's official advisory.