{"cve":{"cve_id":"CVE-2026-87886","is_kev":true,"kev_date_added":"2026-09-16","kev_vendor_project":"Acronis","kev_product":"Backup","kev_vulnerability_name":"Acronis Backup Incorrect Default Permissions Vulnerability","kev_short_description":"Acronis Backup plugin for cPanel & WHM and extension for Plesk contains an incorrect default permissions vulnerability that could allow for privilege escalation.","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":"2026-09-19","kev_known_ransomware":false,"kev_notes":"https://security-advisory.acronis.com/advisories/SEC-10986 ; 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-2026-87886","kev_cwes":["CWE-276"],"epss_score":null,"epss_percentile":null,"epss_as_of":null,"description":"Local privilege escalation due to insecure file permissions. The following products are affected: Acronis Backup plugin for cPanel & WHM (Linux) before build 1.9.3.1021, Acronis Backup extension for Plesk (Linux) before build 1.8.11.638, Acronis Backup plugin for DirectAdmin (Linux) before build 1.2.3.238.","published_at":"2026-09-17T22:57:18.089000Z","last_modified_at":null,"cvss_v3_score":7.8,"cvss_v3_vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-276"],"nvd_references":["https://security-advisory.acronis.com/advisories/SEC-10986"],"vuln_status":null,"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":"2026-09-17T01:01:57.089474Z","updated_at":"2026-09-18T07:06:02.701577Z"},"effective_severity":"HIGH","badges":["kev"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"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":null,"metrics":[]},"affected":[{"vendor_slug":"acronis","vendor_name":"Acronis","product_slug":"acronis-backup-extension-for-plesk","product_name":"Acronis Backup extension for Plesk","version_start":"unspecified","version_start_inclusive":true,"version_end":"1.8.11.638","version_end_inclusive":false,"cpe23_uri":"cve5:acronis:acronis-backup-extension-for-plesk:unspecified:1.8.11.638"},{"vendor_slug":"acronis","vendor_name":"Acronis","product_slug":"acronis-backup-plugin-for-cpanel-whm","product_name":"Acronis Backup plugin for cPanel & WHM","version_start":"unspecified","version_start_inclusive":true,"version_end":"1.9.3.1021","version_end_inclusive":false,"cpe23_uri":"cve5:acronis:acronis-backup-plugin-for-cpanel-whm:unspecified:1.9.3.1021"},{"vendor_slug":"acronis","vendor_name":"Acronis","product_slug":"acronis-backup-plugin-for-directadmin","product_name":"Acronis Backup plugin for DirectAdmin","version_start":"unspecified","version_start_inclusive":true,"version_end":"1.2.3.238","version_end_inclusive":false,"cpe23_uri":"cve5:acronis:acronis-backup-plugin-for-directadmin:unspecified:1.2.3.238"}],"exploit_refs":[],"news":[],"references":[{"url":"https://security-advisory.acronis.com/advisories/SEC-10986","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"cisa_reported","at":"2026-09-16T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"published","at":"2026-09-17T22:57:18.089000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-09-18T00:03:42.160051Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-09-18T00:03:42.160051Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-09-18T00:03:42.160051Z","label":"CVSS score revised","source":"cvelistv5"}]}