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Known exploited vulnerability

CVE-2026-18556

highCVSS 4.0 8.2In CISA KEVEPSS 7.9%Published · N-able

The short answer

CVE-2026-18556 affects N-able N-central and is rated high (CVSS 8.2). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-08-04: attackers are using it, so patch it first.

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.

Weakness: CWE-288.

Severity

8.2 high

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploited (CISA KEV)

Yes, since Aug 4, 2026

Federal due date Aug 7, 2026

EPSS, next 30 days

7.9%

Higher than 95% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
High
Attack requirements
None
Privileges required
None
User interaction
None
Confidentiality impact
High
Integrity impact
None
Availability impact
None

What CISA says to do

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…

Affected products

N-central. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-18556 being exploited?

Yes. CISA added CVE-2026-18556 to its Known Exploited Vulnerabilities catalog on 2026-08-04, with a federal remediation due date of 2026-08-07.

How do I fix CVE-2026-18556?

CISA's required action: 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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