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Vulnerabilities

Vulnerability · CVE-2026-18556

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

Published Aug 1, 2026 · catalog updated Aug 4, 2026 · N-able N-central

Patch now

CVE-2026-18556 is in the CISA known-exploited catalog, due Aug 7, 2026. Confirm N-able N-central against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High8.2
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
7.88%
Remediation
Remediation guidance
Affected products
cpe n-able/n-central · vendor N-able N-central

Overview On August 2, 2026, N-able published a security advisory for CVE-2026-18577 , an authentication bypass vulnerability affecting N-central that was discovered being exploited in-the-wild after an incomplete fix for an earlier authentication bypass issue, CVE-2026-18556 was disclosed. CVE-2026-18577 allows a remote unauthenticated attacker to bypass authentication and obtain administrative control of vulnerable N-central servers in affected deployments. N-able N-central is a widely deployed Remote Monitoring and Management (RMM) platform used by managed service providers (MSPs) and enterp

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe n-able/n-centralversion unspecified
  • vendor N-able N-centralversion unspecified

How to fix CVE-2026-18556

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-18556 is in the CISA known-exploited catalog, due Aug 7, 2026. Confirm N-able N-central against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. 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.

What should an analyst verify?

CWE-288. EPSS 7.88%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 1, 2026 · Catalog

    Detected

    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.

  2. Aug 4, 2026 · CISA KEV

    Known exploited

    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

  3. Aug 4, 2026 · Catalog

    Updated

    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.

  4. Aug 7, 2026 · CISA KEV

    Remediation due

    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

Sources

  • CISA KEVConfirmed exploitationCVE-2026-18556

    N-able N-central contains an authentication bypass using an alternate path or channel that allows for authentication bypass.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2026-18556

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-18556

    30-day exploitation probability 7.9%

    first.org
  • NIST NVDVulnerability recordCVE-2026-18556

    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.

    nvd.nist.gov
  • Rapid7 Vulnerability DatabaseResearchCVE-2026-18556

    Overview On August 2, 2026, N-able published a security advisory for CVE-2026-18577 , an authentication bypass vulnerability affecting N-central that was discovered being exploited in-the-wild after an incomplete fix for an earlier authentication bypass issue, CVE-2026-18556 was disclosed. CVE-2026-18577 allows a remote unauthenticated attacker to bypass authentication and obtain administrative co

    rapid7.com
  • VulnCheck KEVConfirmed exploitationCVE-2026-18556

    N-able N-central contains an authentication bypass using an alternate path or channel that allows for authentication bypass.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.