CVE-2026-18577

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

As of , CVE-2026-18577 in N-able N-central is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch now.

Exploited
Yes: CISA listed it on 3 August 2026
US federal deadline
6 August 20263 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
Forensic triage
Required by CISA under BOD 26-04Agencies must also look for signs that attackers already got in.
EPSS score
0.15Higher than 96% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
Vendor advice: documentation.n-able.com and status.n-able.comLinks below, from CISA's entry.

What CISA says to do

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.

CISA's required action

What the flaw is

N-able N-central contains an authentication bypass using an alternate path or channel allows for authentication bypass and account takeover in N-central. This vulnerability is the result of an incomplete patch for CVE-2026-18556.

CISA's description

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

The CVE record's description, from N-able

CVE published
2 August 2026
Assigned by
N-able
CVSS
8.2 High (CVSS 4.0, from the CNA)
CWE-288
Authentication Bypass Using an Alternate Path or Channel
CISA SSVC, exploitation
active
CISA SSVC, automatable
yes
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

N-central: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2026-86218Static Code InjectionN-able N-centralPatch nowForensic triage required by CISA0.13
CVE-2026-18556Authentication Bypass Using an Alternate Path or ChannelN-able N-centralPatch nowForensic triage required by CISA0.08
CVE-2025-8876Command InjectionN-able N-CentralPatch soon0.03
CVE-2025-8875Insecure DeserializationN-able N-CentralPatch soon0.02

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