CVE-2026-18556

Unauthenticated administrative account takeover

HIGH

7.4

CVSS Score

Published: August 1, 2026 at 07:59 PM UTC

Updated: October 23, 2026 at 10:10 PM UTC

1 product affected across 1 vendorN Central

Using N-central by N-able?

Get instant alerts when new vulnerabilities affect N-central - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH7.4

Exploitation

CISA KEV

Exploit prediction

EPSS 8%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score7.9%

EPSS (Exploit Prediction Scoring System) estimates a 7.9% chance this CVE is exploited in the wild within the next 30 days — higher than 95% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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

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.

Ransomware Use

Unknown

Added to KEV

Aug 4, 2026

Remediation Due

Aug 7, 2026

86 days overdue

Notes

https://uptime.n-able.com/

https://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577/

BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk

Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk

https://nvd.nist.gov/vuln/detail/CVE-2026-18556

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.