CVE-2026-18556: CISA Warns of Active N-able N-central Flaw

What This Means

CVE ID: CVE-2026-18556
Vendor/Product: N-able N-central
Vulnerability: N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability
Description: N-able N-central contains an authentication bypass using an alternate path or channel that allows for authentication bypass.
Added to CISA's Known Exploited Vulnerabilities catalog: 2026-08-04 (this means CISA has confirmed active, real-world exploitation)
Federal remediation due date: 2026-08-07
Required action: 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.
Known ransomware campaign use: Unknown
Weakness types (CWE): CWE-288

How to Fix It

• Apply mitigations per vendor instructions immediately
• Comply with CISA BOD 26-04 patching requirements
• Conduct forensics triage as required by CISA
• Restrict internet exposure of the N-central management interface