CVE-2026-18556

CVE Enrichment

CVSS: 8.2 HIGH
EPSS: 7.88%
EPSS Percentile: 94.59%
CISA KEV: YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: a5532a13-c4dd-4202-bef1-e0b8f2f8d12b
Published: 02-Aug-2026 03:16
Last Modified: 05-Aug-2026 12:16
EPSS Date: 2026-10-11
CWE: CWE-288

CVSS Vector


            CVSS:4.0                            AV:N /
                            AC:H /
                            AT:N /
                            PR:N /
                            UI:N /
                            VC:H /
                            VI:N /
                            VA:N /
                            SC:N /
                            SI:N /
                            SA:N /
                            E:X /
                            CR:X /
                            IR:X /
                            AR:X /
                            MAV:X /
                            MAC:X /
                            MAT:X /
                            MPR:X /
                            MUI:X /
                            MVC:X /
                            MVI:X /
                            MVA:X /
                            MSC:X /
                            MSI:X /
                            MSA:X /
                            S:X /
                            AU:X /
                            R:X /
                            V:X /
                            RE:X /
                            U:X

CISA KEV Details

Date Added: 2026-08-04
Remediation Due: 2026-08-07
Known Ransomware Campaign Use: Unknown
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.
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

Affected Products / Versions

n-able / n-central
Version / affected range: * · through (inclusive) 2026.1
cpe:2.3:a:n-able:n-central:*:*:*:*:*:*:*:*

References

Last enrichment sync: 12-Oct-2026 18:12
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (3)

in the top-ten chart) highlighted exploitation of N-able N-central authentication bypass flaws in the CVE-2026-18556 / CVE-2026-18577 family, converting unpatched internet-facing RMM admin planes into full Ransomware Disclosures Fell to 862 in September as Affiliates Continued Evolving Their Tactics
CVE-2026-18556 Recorded Future Identifies 73 High-Impact Vulnerabilities in August, 70 Actively Exploited
and CVE-2026-86207), completely distinct from the flaws addressed by N-able's August hotfixes (CVE-2026-18556 and CVE-2026-18577). N-able Issues N-central Hotfix 4 for Actively Exploited Pre-Auth RCE

CVE (75)

Malware (5)

People (13)

Threat Actors (34)

MITRE ATT&CK (5)

Vendors (26)

Products (35)

Tools (23)

Industries (11)

Countries (8)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.