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Identity CVE · Other

CVE-2026-18577N-able N-central auth bypass, incomplete patch of CVE-2026-18556

criticalCISA KEVActively exploited
Product: N-able N-centralVendor: N-ableDisclosed: 2026-08-03Status: Actively exploitedNVD ↗CISA KEV ↗

What broke

N-able N-central, the RMM platform MSPs use to administer customer estates, had an authentication bypass that became account takeover. The first patch (CVE-2026-18556) did not close the path. CVE-2026-18577 is the leftover. Exploitation is in the wild. CISA added it to KEV on 3 August 2026.

Why it matters

N-central is a meta-IdP: it holds admin access to many customer networks. An incomplete fix on that plane is the same story as Fortinet's follow-on SSO bypass. Attackers waited for the first patch bulletin, then used the leftover.

What to do

  • Upgrade to the N-central build that names CVE-2026-18577 (N-able cited 2026.3.1.7 in public notes). Confirm the build string.
  • Hunt for new admin users and unexpected remote sessions from early August 2026, even if you "already patched 18556."
  • If you are an MSP customer, ask your provider for the build and for a list of admin accounts.

Sources

Related identity CVEs

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Compiled from vendor advisories, NVD, CISA KEV, and public research. CVSS figures can disagree across NVD and the CNA. Confirm affected versions against the vendor advisory before you patch. Independent, community-driven analysis. See the disclaimer.