CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Called exploited the same day it was disclosed.
Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.
The life of this vulnerability
- CVE published
- First KEV listingsame day
- Last KEV listing3d
- Last sighting12d
Gaps are compressed to equal steps. The elapsed time is printed under each.
Which catalogues call it exploited
- CISA KEVUS federallisted Aug 4, 2026
- EUVDENISA, European Unionlisted Aug 4, 2026
- VulnCheck KEVcommercial researchlisted Aug 1, 2026
- CIRCLaggregator, mirrors the abovelisted Aug 1, 2026, not counted
3 catalogues list it. CIRCL aggregates the others and is shown but not counted.
Public exploitation evidence
- reported exploitationwww.cyber.gov.au/about-us/view-all-content/alerts-and-adviso
- reported exploitationcydome.io/maritime-cybersecurity-bulletin-august-7th-2026/
- reported exploitationuptime.n-able.com/event/201522/
- reported exploitationwww.cisa.gov/sites/default/files/feeds/known_exploited_vulne
- reported exploitationwww.huntress.com/blog/n-able-vulnerability-exploitation
- reported exploitationprevidian.com/CVE-2026-18556
7 public reports collected from VulnCheck and CIRCL, first on Aug 1, 2026. Each links to its original source. We have not verified them.
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.
Required action (CISA)
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.
