{"cve":{"cve_id":"CVE-2026-18556","is_kev":true,"kev_date_added":"2026-08-04","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 that allows for authentication bypass.","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":"2026-08-07","kev_known_ransomware":false,"kev_notes":"https://uptime.n-able.com/ ; 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-2026-18556","kev_cwes":["CWE-288"],"epss_score":0.03928,"epss_percentile":0.89577,"epss_as_of":"2026-08-26","description":"Authentication bypass using an alternate path or channel vulnerability in N-able N-central allows Authentication Bypass.\n\nThis issue affects N-central: through 2026.1.","published_at":"2026-08-01T19:59:30.913000Z","last_modified_at":"2026-08-05T05:16:46.967000Z","cvss_v3_score":7.4,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cvss_v3_severity":"HIGH","cvss_v4_score":8.2,"cvss_v4_vector":"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","cvss_v4_severity":"HIGH","ssvc_decision":null,"ssvc_exploitation":"active","ssvc_automatable":true,"ssvc_technical_impact":"total","cwes":["CWE-288"],"nvd_references":["https://uptime.n-able.com/"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-08-01T20:17:26.046610Z","updated_at":"2026-08-06T20:16:20.006012Z"},"effective_severity":"HIGH","badges":["kev","news"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack 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":"N","value_label":"None"}]},"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 Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"N","value_label":"None"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"N","value_label":"None"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"N","value_label":"None"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"N","value_label":"None"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"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":"2026.1","version_end_inclusive":true,"cpe23_uri":"cve5:n-able:n-central:0:2026.1"},{"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":"2026.1","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:n-able:n-central:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"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-2026-18556"]}],"references":[{"url":"https://uptime.n-able.com/","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-08-01T19:59:30.913000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-08-03T17:18:26.053606Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-03T17:18:26.053606Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-03T17:18:26.053606Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cisa_reported","at":"2026-08-04T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"first_article","at":"2026-08-04T07:00:13Z","label":"First news coverage","source":"The Hacker News"},{"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":"ssvc_changed","at":"2026-08-04T18:41:38.297163Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-05T03:41:38.287526Z","label":"SSVC decision 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