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CVE-2026-18577

N-able N-central Authentication Bypass Using an Alternate Path or Channel

8.1 HIGHActively exploited (CISA KEV)EPSS 14.6%
  1. Published2 Aug 2026
  2. Added to CISA KEV3 Aug 2026
  3. Remediation due6 Aug 2026
Actively exploited (CISA KEV)

N-able N-central contains an authentication bypass using an alternate path or channel allows for authentication bypass and account takeover in N-central. This vulnerability is the result of an incomplete patch for CVE-2026-18556.

Added to KEV: 3 Aug 2026Federal remediation due: 6 Aug 2026

Description

An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

N-able N-central< 2026.3 · 2026.3

Remediation

Fixed in
N-able N-central≥ 2026.3

References

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Frequently asked

Is CVE-2026-18577 being actively exploited?

Yes. CVE-2026-18577 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Aug 2026.

How severe is CVE-2026-18577?

CVE-2026-18577 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 14.6% probability of exploitation.

Which products are affected by CVE-2026-18577?

Affected products include N-able N-central.

How do I fix CVE-2026-18577?

Upgrade affected software to a fixed version, for example N-able N-central 2026.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-18577 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.