All vulnerabilities
CVE-2026-87886

Acronis Backup Incorrect Default Permissions Vulnerability

Acronis Backup
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationExploited in the wildAdded to KEV 16 Sep 2026CISA KEV
Exploit odds (EPSS)0.23%Chance of exploitation activity in the next 30 days, higher than 13% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.9.3.1021Also 1.8.11.638, 1.2.3.238CVE List
Federal deadline19 Sep 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply 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. CISA KEV
Patching is not enoughCISA requires federal agencies to look for signs of compromise on affected systems, not only patch (forensic triage under BOD 26-04). Treat exposed systems as possibly compromised. CISA guidance

What fixes it

  • 1.9.3.1021Acronis Backup plugin for cPanel & WHMCVE List
  • 1.8.11.638Acronis Backup extension for PleskCVE List
  • 1.2.3.238Acronis Backup plugin for DirectAdminCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 16 Sep 2026Added to CISA KEVCISA KEV
  2. 17 Sep 2026, 22:57 UTCPublishedCVE List

Description

Acronis Backup plugin for cPanel & WHM and extension for Plesk contains an incorrect default permissions vulnerability that could allow for privilege escalation.

Text from CVE List

Affected versions 3

  • Acronis Backup plugin for cPanel & WHMaffected: unspecified before 1.9.3.1021CVE List
  • Acronis Backup extension for Pleskaffected: unspecified before 1.8.11.638CVE List
  • Acronis Backup plugin for DirectAdminaffected: unspecified before 1.2.3.238CVE List

References 3