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CVE-2026-18556

N-Able N-Central•HIGH · CVSS 7.4• In the wild In CISA KEV

What is CVE-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.

CVSS7.4 NVD 3.1

SeverityHIGH

Exploitation In the wild In CISA KEV

EPSS8% · P95

Triage statusActive Exploit

ActionPatch immediately

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

CWECWE-288

NVD published2026-08-01

NVD last modified2026-10-23

Timeline

2026-08-01Published to the U.S. National Vulnerability Database (NVD)
2026-08-04Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-08-06First covered in a defend.network daily briefing
2026-08-07CISA federal remediation deadline (BOD 22-01)
2026-10-23NVD record last updated

CISA Known Exploited Vulnerability

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

Added to KEV2026-08-04

Federal patch deadline2026-08-07

Known ransomware useUnknown

Affected product

N-Able N-Central

Remediation Steps

Apply the vendor security update for N-Able N-Central as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 5 of August 2026 (August 31 – September 6)
Vulnerability Priority Report – Week 4 of August 2026 (August 24 – 30)
Vulnerability Priority Report – Week 3 of August 2026 (August 17 – 23)
Vulnerability Priority Report – Week 2 of August 2026 (August 10 – 16)
Vulnerability Priority Report – Week 1 of August 2026 (August 3 – 9)
Linux KVM escape, Cisco SD-WAN patches, Spectre v2 defenses bypassed (2026-08-07)
IBM Langflow, Apache Tomcat, N-able RCE and auth bypass actively exploited (2026-08-06)

Related vulnerabilities

CVE-2026-18577 – N-Able N-Central (same product)
CVE-2026-86218 – N-Able N-Central (same product)
CVE-2026-19490 – Citrix NetScaler (same weakness: CWE-288)
CVE-2026-34040 – Docker Engine (same weakness: CWE-288)
CVE-2026-20079 – Cisco Secure Firewall Management Center (FMC) And Security Cloud Control (SCC) Firewall Management (same weakness: CWE-288)

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.