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CVE-2026-18556

High CVSS 7.4 Known exploited

Published 2026-08-01 · last changed 2026-08-05 · added to CISA KEV 2026-08-04

This one is being exploited in the wild.

CISA added CVE-2026-18556 to the Known Exploited Vulnerabilities catalog on 2026-08-04. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2026-18556, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

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.

Sources

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