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CVE-2026-18577

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

Published · Added to CISA KEV
CVSS8.1
Severityhigh
WeaknessCWE-288
ExploitedYes, in CISA KEV
Ransomware useUnknown
Federal fix dueAug 6, 2026

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

Description

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

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-2026-18577

CVE-2026-18577

N-able ships second N-central hotfix as attackers keep exploiting CVE-2026-18577

To help customers fend off ongoing attacks, N-able released a second security hotfix for N‑central, its monitoring and management (RMM) solution popular with managed service providers (MSPs). “Hotfix 2 is required, even if you already applied the earlier hotfix. Hotfix 2 supersedes Hotfix 1 with additional hardening measures to further protect you and your customers,” the company said, and shared

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.

CVE-2026-18577

N-able warns of N-central auth bypass flaw exploited in attacks

N-able is warning customers that hackers are exploiting an authentication bypass vulnerability (CVE-2026-18577) affecting both hosted and on-premises N-central servers. [...]