CVE-2026-18577

Name: CVE-2026-18577
Creator: NVD / NIST
Published: 2026-08-02T23:16:26.21+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10Actively ExploitedEPSS 2.53%

Last modified Aug 4, 2026

CVE-2026-18577 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 2026.3.1. CISA has confirmed active exploitation in the wild. EPSS estimates a 2.53% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

8.1/10

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

CVSS 4.0

8.2/10

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 Probability

2.53%

83.3th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Aug 6, 2026.

Weakness Enumeration

CWE-288

Affected Software

Vendor	Product	Versions
N-Able	N-Central	< 2026.3
N-Able	N-Central	2026.3

References

https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htmPatch, Release Notes
https://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577/Release Notes
https://www.cve.org/CVERecord?id=CVE-2026-18556VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-18577US Government Resource
https://www.n-able.com/blog/n-central-security-update-august-2-2026Vendor Advisory

Timeline

Published: Aug 2, 2026
Last Modified: Aug 4, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-18577?

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

How severe is CVE-2026-18577?

CVE-2026-18577 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 2.53% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2026-18577?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST