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CVE-2026-18556

N-able · N-central · N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability

Published · Added to CISA KEV
CVSS7.4
Severityhigh
WeaknessCWE-288
ExploitedYes, in CISA KEV
Ransomware useUnknown
Federal fix dueAug 7, 2026

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Required action (CISA)

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.

References

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Our coverage of CVE-2026-18556

CVE-2026-18577high

N-able Issues N-central Hotfix 2 as Attackers Reach Managed Systems and Persist

N-able has released Hotfix 2 for its N-central platform to address an actively exploited zero-day vulnerability. Attackers leveraged this flaw to gain administrative access, persist on managed systems using Cloudflare Tunnel, and maintain access even after the initial exploit was mitigated. The company confirmed a limited number of customers were affected and is providing additional indicators of compromise and tools for detection.