CVE-2026-18577

high

Description

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

References

Exploits
More

https://securityaffairs.com/197119/malware/storm-1175-replaces-medusa-with-new-stormencryptor-ransomware.html

https://www.helpnetsecurity.com/2026/08/10/cve-2026-18577-n-central-hotfix-2-msps/

https://www.databreachtoday.com/china-linked-hackers-use-n-able-flaw-in-ransomware-attacks-a-32506

https://www.databreachtoday.com/china-linked-hackers-exploit-n-able-flaw-in-ransomware-attacks-a-32506

https://www.bleepingcomputer.com/news/security/new-stormencryptor-ransomware-used-by-former-medusa-affiliate/

https://therecord.media/china-hackers-ransomware-microsoft

https://thehackernews.com/2026/08/china-linked-hackers-deploy-new.html

https://thehackernews.com/2026/08/n-central-attackers-reach-managed.html

https://www.theregister.com/networks/2026/08/07/n-able-god-mode-flaw-vendor-confirms-attackers-reached-customer-networks-as-second-hotfix-lands/5284730

https://www.securityweek.com/cisa-warns-of-exploited-langflow-n-central-and-tomcat-vulnerabilities/

https://thehackernews.com/2026/08/cisa-flags-langflow-rce-tomcat-and-n.html

https://www.theregister.com/security/2026/08/04/feds-get-3-days-to-patch-n-able-god-mode-flaw-under-active-exploit/5282894

https://www.sophos.com/en-us/blog/nable-ncentral-exploitation-results-in-rmm-tool-deployment

https://thehackernews.com/2026/08/cisa-adds-exploited-n-able-n-central.html

https://securityaffairs.com/196585/security/u-s-cisa-adds-a-n-able-n-central-flaw-to-its-known-exploited-vulnerabilities-catalog.html

https://www.securityweek.com/n-able-patches-vulnerability-exploited-to-hack-n-central-servers/

https://www.itsecurityguru.org/2026/08/03/critical-n-able-n-central-vulnerability-under-active-exploitation-as-hotfix-lands/?utm_source=rss&utm_medium=rss&utm_campaign=critical-n-able-n-central-vulnerability-under-active-exploitation-as-hotfix-lands

https://www.helpnetsecurity.com/2026/08/03/cve-2026-18577-n-able-n-central-vulnerability/

https://www.databreachtoday.com/n-able-flaw-exposes-msps-to-worst-case-scenario-a-32397

https://www.darkreading.com/vulnerabilities-threats/attackers-exploit-n-able-patch-bypass-flaw

https://www.cisa.gov/news-events/alerts/2026/08/03/cisa-adds-one-known-exploited-vulnerability-catalog

https://www.bleepingcomputer.com/news/security/n-able-warns-of-n-central-auth-bypass-flaw-exploited-in-attacks/

https://thehackernews.com/2026/08/n-able-says-attackers-take-over-n.html

https://hackread.com/hackers-exploit-n-able-n-central-flaw-initial-fix/

https://www.n-able.com/blog/n-central-security-update-august-2-2026

https://www.cve.org/CVERecord?id=CVE-2026-18556

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-18577

https://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577/

https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm

Details

Source: Mitre, NVD

Published: 2026-08-02

Updated: 2026-08-04

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 7.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.1

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

Severity: High

CVSS v4

Base Score: 8.2

Vector: 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

Severity: High

EPSS

EPSS: 0.02529

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest