---
title: "CVE-2026-18556: N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-18556/
description: "CVE-2026-18556 (N-able N-central): Exploited in the wild (CISA KEV). Authentication bypass using an alternate path or channel vulnerability in N-able…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-01
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-18556"
kev: true
cvss: 8.2
epss: 0.07882
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-18556: N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run N-able N-central. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-08-04, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-08-07 ; treat that as the outer limit, not the target.
- EPSS 7.9% , percentile 95: FIRST’s model estimates a 7.9% chance of exploitation activity in the next 30 days, higher than 95% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Act now. N-able N-central: Exploited Auth Bypass and Pre-Auth RCE — Any self-hosted N-central server below 2026.3.1.14 should be treated as exposed and patched today, and any server that was patched late needs a compromise review, because one stolen RMM console reaches every managed endpoint.

## What it is

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.

## Affected products (CVE record)

- N-able N-central: <= 2026.1

## Severity

- N-able CVSS 4.0: 8.2 `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`

## Exploitation

- CISA KEV: added 2026-08-04; federal due date 2026-08-07. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 7.88% probability of exploitation activity in the next 30 days; percentile 95.

## Sources

- [n-able.com](https://www.n-able.com/blog/n-central-security-update-august-2-2026)
- [Listed in CISA KEV notes (uptime.n-able.com)](https://uptime.n-able.com/)
- [Listed in CISA KEV notes (status.n-able.com)](https://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577/)
- [CVE.org record CVE-2026-18556](https://www.cve.org/CVERecord?id=CVE-2026-18556)
- [NVD entry CVE-2026-18556](https://nvd.nist.gov/vuln/detail/CVE-2026-18556)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-18556)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)

---
Source page: https://erroneo.us/security/cve/CVE-2026-18556/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt