{"cve":{"cve_id":"CVE-2026-18577","is_kev":true,"kev_date_added":"2026-08-03","kev_vendor_project":"N-able","kev_product":"N-central","kev_vulnerability_name":"N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability","kev_short_description":"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.","kev_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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","kev_due_date":"2026-08-06","kev_known_ransomware":false,"kev_notes":"https://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","kev_cwes":["CWE-288"],"epss_score":0.06153,"epss_percentile":0.92936,"epss_as_of":"2026-08-26","description":"An incomplete patch for CVE-2026-18556 allows for authentication bypass and account takeover in N-central Versions through 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Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User 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System)","value":"L","value_label":"Low"},{"metric":"E","name":"E","value":"A","value_label":"Adjacent"}]},"affected":[{"vendor_slug":"n-able","vendor_name":"N-able","product_slug":"n-central","product_name":"N-central","version_start":"0","version_start_inclusive":true,"version_end":"2026.3","version_end_inclusive":true,"cpe23_uri":"cve5:n-able:n-central:0:2026.3"},{"vendor_slug":"n-able","vendor_name":"N-able","product_slug":"n-central","product_name":"N-central","version_start":"2026.3.1.7","version_start_inclusive":true,"version_end":"2026.3.1.7","version_end_inclusive":true,"cpe23_uri":"cve5:n-able:n-central:2026.3.1.7:2026.3.1.7"},{"vendor_slug":"n-able","vendor_name":"N-able","product_slug":"n-central","product_name":"N-central","version_start":null,"version_start_inclusive":null,"version_end":"2026.3","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:n-able:n-central:*:*:*:*:*:*:*:*"},{"vendor_slug":"n-able","vendor_name":"N-able","product_slug":"n-central","product_name":"N-central","version_start":"2026.3","version_start_inclusive":true,"version_end":"2026.3","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:n-able:n-central:2026.3:-:*:*:*:*:*:*"}],"exploit_refs":[{"source":"nuclei","kind":"nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-18577.yaml","title":"N-able N-central < 2026.3.1.10 - Authentication Bypass","author":"patrick-threatmate","disclosed_at":null}],"news":[{"id":989,"source":"The Hacker News","url":"https://thehackernews.com/2026/08/cisa-adds-exploited-n-able-n-central.html","title":"CISA Adds Exploited N-able N-central Flaw to KEV After Customer Compromises","summary":"The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Monday added a high-severity security flaw impacting N-able N-central to its Known Exploited Vulnerabilities (KEV) catalog following reports of active exploitation in the wild.\n\nThe vulnerability, tracked as CVE-2026-18577 (CVSS score: 8.2), is a case of incomplete patching for CVE-2026-18556 (CVSS score: 8.2) that allows","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbA9omGpwD_xkaXsQD13QewwbHkZMx1FrBHBvsnFkbjkFTY6F679EEe_xtesc1R6ToZIZlHq4osq4AmGAI-74IHaagkIP7KhQp3X_QtlwaMx2ALTqs_sZTdtpmJNd1UHf_Mq2F9jfmz8viAlapY4gFUa5ZLAEtF_VjjzebWZApbU1VDElceFwS4sa2rR5C/s1600/cisa.png","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-08-04T07:00:13Z","fetched_at":"2026-08-04T08:15:26.268780Z","trending_score":0.00045357864286358246,"cve_ids":["CVE-2026-18577"]},{"id":985,"source":"Dark Reading","url":"https://www.darkreading.com/vulnerabilities-threats/attackers-exploit-n-able-patch-bypass-flaw","title":"Attackers Exploit N-able Patch Bypass Flaw on RMM Servers","summary":"Over the weekend, the vendor discovered another vector of authentication bypass CVE-2026-18577 that gives attackers administrator access.","thumbnail_url":"https://eu-images.contentstack.com/v3/assets/blt6d90778a997de1cd/blt38063499658fdf3d/6a70e89e220415e290089159/N_able_Ontario_Office-JHVEPhoto-GettyImages-2153902736.jpg?width=720&quality=80&disable=upscale","author":"Alexander Culafi","published_at":"2026-08-03T21:21:11Z","fetched_at":"2026-08-03T21:45:26.962831Z","trending_score":0.00031002319705590516,"cve_ids":["CVE-2026-18577"]},{"id":976,"source":"BleepingComputer","url":"https://www.bleepingcomputer.com/news/security/n-able-warns-of-n-central-auth-bypass-flaw-exploited-in-attacks/","title":"N-able warns of N-central auth bypass flaw exploited in attacks","summary":"N-able is warning customers that hackers are exploiting an authentication bypass vulnerability (CVE-2026-18577) affecting both hosted and on-premises N-central servers. [...]","thumbnail_url":null,"author":"Bill Toulas","published_at":"2026-08-03T17:00:56Z","fetched_at":"2026-08-03T17:15:26.241541Z","trending_score":0.00034414574755436343,"cve_ids":["CVE-2026-18577"]},{"id":966,"source":"The Hacker News","url":"https://thehackernews.com/2026/08/n-able-says-attackers-take-over-n.html","title":"N-able Says Attackers Take Over N-central Servers After Initial Fix Proves Incomplete","summary":"N-able said attackers exploited an authentication bypass in N-central to gain remote administrative access and reach the customer systems managed through those servers.\n\nIts first fix was incomplete. CVE-2026-18577 affects N-central builds prior to 2026.3.1.7. N-able shipped build 2026.3.1.7 on August 2 as the first unaffected version.\n\nN-central is the remote monitoring and management platform","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjs1H8Wx5_ZrUFksG2Tgb_6qho5XHULdP13qVeYXx1xWPPt8B2rH68XC6IhzBk-dczgsdWvpZ_dVTI7AIMsgK1EeU3B89WVUJu2N5B71FQ4GnlZDRlvNiD4pGO2hBCJGVowjUVDMSHAO_0CPlYthpa8jx-Af5OwB6ZMDr-PKTYDJKjP4pGCZZolbjbGi44/s1600/n-able.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-08-03T06:41:46Z","fetched_at":"2026-08-03T07:30:26.600618Z","trending_score":0.0002736921469457625,"cve_ids":["CVE-2026-18577"]}],"references":[{"url":"https://documentation.n-able.com/N-central/Release_Notes/GA/Content/N-central_2026.3_HF1_Release_Notes.htm","source_type":"MISC","tags":[]},{"url":"https://status.n-able.com/2026/08/02/n-central-2026-3-hotfix-1-mitigation-for-cve-2026-18577/","source_type":"MISC","tags":["patch"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18556","source_type":"CONFIRM","tags":[]}],"timeline":[{"type":"published","at":"2026-08-02T22:06:18.296000Z","label":"CVE published","source":null},{"type":"cisa_reported","at":"2026-08-03T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"first_article","at":"2026-08-03T06:41:46Z","label":"First news coverage","source":"The Hacker News"},{"type":"ssvc_changed","at":"2026-08-03T16:18:26.061395Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-03T16:18:26.061395Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-03T16:18:26.061395Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-03T21:18:26.046490Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-04T14:18:26.047294Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-04T14:18:26.047294Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-08-05T17:40:08.289516Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-08-05T17:40:08.289516Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-08-05T17:40:08.289516Z","label":"CVSS score revised","source":"nvd"},{"type":"poc_available","at":"2026-08-26T17:38:11.388928Z","label":"Public PoC available","source":"nuclei"}]}