// CVE

CVE-2026-18577

High 8.2 Exploited (KEV)

N-able N-central

8.2CVSS
15%EPSS
YesCISA KEV

Summary

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

Published: 2026-08-02 · In KEV since: 2026-08-03

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:L/SI:L/SA:L/E:A

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.