Incomplete patch leads to administrative account takeover

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-18577
StatePUBLISHED
AssignerN-able
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-02 23:16:26 UTC
Updated2026-08-04 14:27:12 UTC
DescriptionAn incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1

Risk And Classification

Primary CVSS: v4.0 8.2 HIGH from a5532a13-c4dd-4202-bef1-e0b8f2f8d12b

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L/E:A/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

EPSS: 0.540680000 probability, percentile 0.989600000 (date 2026-09-05)

CISA KEV: Listed on 2026-08-03; due 2026-08-06; ransomware use Unknown

Problem Types: CWE-288 | CWE-288 CWE-288 Authentication bypass using an alternate path or channel

VersionSourceTypeScoreSeverityVector
4.0a5532a13-c4dd-4202-bef1-e0b8f2f8d12bSecondary8.2HIGHCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L/E:A/C...
4.0CNACVSS8.2HIGHCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L/E:A
3.1[email protected]Primary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
None
Availability
None
Sub Conf.
Low
Sub Integrity
Low
Sub Availability
Low

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L/E:A/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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CISA Known Exploited Vulnerability

VendorN-able
ProductN-central
NameN-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability
Required ActionApply 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.
Noteshttps://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm ; https://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-18577

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application N-able N-central All All All All
Application N-able N-central 2026.3 - All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA N-able N-central affected 2026.3 custom Not specified
CNA N-able N-central unaffected 2026.3.1.7 custom Not specified

References

ReferenceSourceLinkTags
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-... a5532a13-c4dd-4202-bef1-e0b8f2f8d12b status.n-able.com Release Notes
www.n-able.com/blog/n-central-security-update-august-2-2026 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.n-able.com Vendor Advisory
documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Relea... a5532a13-c4dd-4202-bef1-e0b8f2f8d12b documentation.n-able.com Patch, Release Notes
www.cve.org/CVERecord a5532a13-c4dd-4202-bef1-e0b8f2f8d12b www.cve.org VDB Entry
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

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