CVE-2026-87886
Acronis Backup Incorrect Default Permissions Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-09-16. Federal due date: 2026-09-19.
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.
Impact
Acronis Backup plugin for cPanel & WHM and extension for Plesk contains an incorrect default permissions vulnerability that could allow for privilege escalation.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Acronis | Acronis Backup Extension For Plesk | from unspecified before 1.8.11.638 |
| Acronis | Acronis Backup Plugin For DirectAdmin | from unspecified before 1.2.3.238 |
| Acronis | Acronis Backup Plugin For CPanel & WHM | from unspecified before 1.9.3.1021 |
| Acronis | Acronis Backup | before 1.2.3 before 1.8.11 before 1.9.3 Version 1.9.3 |