Acronis Backup Incorrect Default Permissions Vulnerability
This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run Backup, fix it now.
CISA 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.
US federal civilian agencies must remediate by Sep 19, 2026.
No official fix confirmed yet
Until a fix ships, follow the vendor's mitigations and CISA's required action, limit exposure of affected systems, and watch this record for a patch.
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.
Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.
| Product | Vendor | Affected versions | Fixed in | Source |
|---|---|---|---|---|
| Backup | Acronis | < 1.2.3; < 1.8.11; < 1.9.3; 1.9.3 | 1.2.3; 1.8.11; 1.9.3 | KEV |
Sources: KEV = CISA Known Exploited Vulnerabilities catalog.
Developments from the last 30 days, newest first.
CVE-2026-87886 scored CVSS 7.8: Acronis Backup, Acronis Backup Incorrect Default Permissions Vulnerability
CISA lists this as exploited in the wild. Unpatched Backup systems are exposed to active attacks now.
Basis: NIST National Vulnerability Database
CVE-2026-87886 added to CISA KEV: Acronis Backup, Acronis Backup Incorrect Default Permissions Vulnerability
CISA lists this as exploited in the wild. Unpatched Backup systems are exposed to active attacks now.
Basis: CISA Known Exploited Vulnerabilities catalog
CISA lists this as exploited in the wild. Unpatched Backup systems are exposed to active attacks now.
Apply the vendor's security update for Backup.
