CVE-2026-18556Unauthenticated administrative account takeover

In plain English

A high-severity authentication bypass in N-central from N-able. Attackers are actively exploiting it in the wild (listed by CISA on August 4, 2026). The chance it is exploited in the next 30 days is estimated at 7.9% (higher than 95% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. 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.