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CVE-2026-18577: authentication bypass in N-able N-central

Remote attackers can bypass authentication on N-able N-central to take over accounts, tracked as CVE-2026-18577. The flaw affects N-central 2026.3 and earlier (2026.x branch) and requires only network access to the vulnerable service; no credentials or user interaction are needed. Successful exploitation can result in full confidentiality, integrity, and availability impact as indicated by the CVSS vector. Vendor fixes are not listed for the affected branch.

Published Updated Source: CVE Program, NVD, CISA KEV, FIRST EPSS

CVSS 3.1
8.1HIGH
EPSS
0.14622
CWE
CWE-288
KEV DUE DATE
PATCH
Not yet

DIRAS TAKE

Urgent: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog with a federal remediation deadline of 2026-08-06, so prioritize mitigation immediately and follow vendor and CISA guidance.

What is CVE-2026-18577?

Remote attackers can bypass authentication on N-able N-central to take over accounts, tracked as CVE-2026-18577. The flaw affects N-central 2026.3 and earlier (2026.x branch) and requires only network access to the vulnerable service; no credentials or user interaction are needed. Successful exploitation can result in full confidentiality, integrity, and availability impact as indicated by the CVSS vector. Vendor fixes are not listed for the affected branch. The weakness is classified as CWE-288 (Authentication Bypass Using an Alternate Path).

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

Which versions of N-able N-central are affected?

BRANCHAFFECTEDFIXED
2026.x2026.3 and earlier

Is CVE-2026-18577 being exploited?

CISA added CVE-2026-18577 to the Known Exploited Vulnerabilities catalog on 2026-08-03, and U.S. federal agencies were required to remediate it by 2026-08-06. Public exploit code is available.

How to fix CVE-2026-18577

  1. Isolate or restrict network exposure of N-central instances from the internet and untrusted networks.
  2. Apply vendor guidance and mitigations immediately; if no vendor patch exists, follow their recommended workarounds.
  3. Harden access controls: restrict management interfaces to trusted IPs and require network-level controls like VPN for administration.
  4. Monitor authentication and administrative logs for anomalous access and perform forensics per CISA recommendations.

Frequently asked questions

Is CVE-2026-18577 being actively exploited?

CISA added CVE-2026-18577 to its Known Exploited Vulnerabilities catalog on 2026-08-03 with a remediation deadline of 2026-08-06, and public exploit code is available.

Which N-central versions are affected by CVE-2026-18577?

N-able N-central versions 2026.3 and earlier (2026.x branch) are listed as affected.

Is there a patch for CVE-2026-18577?

No fixed versions are listed for the affected branch in the provided data; follow vendor guidance and mitigations until a patch is published.

Does CVE-2026-18577 require authentication?

No; the vulnerability permits authentication bypass and does not require valid credentials, only network access to the N-central service.

References