HIGH Actively exploited CWE-276

CVE-2026-87886

Acronis Backup Incorrect Default Permissions Vulnerability

Acronis·Backup

7.8/ 10

CVSS 3.0

High severity

0.23%

EPSS exploit odds

Chance of exploitation in the next 30 days

Higher than 14% of all CVEs

Listed

CISA KEV catalog

Added: Sep 16, 2026
Fix due: Sep 19, 2026
Ransomware: Not known

Timeline

Published: Sep 17, 2026
Updated: Sep 18, 2026
First covered: Sep 19, 2026
Latest story: 2 months ago

Summary

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.

Attack profile

Attack vectorLocal

ComplexityLow

PrivilegesLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Affected products

Acronis Backup plugin for cPanel & WHMunspecified to before 1.9.3.1021
Acronis Backup extension for Pleskunspecified to before 1.8.11.638
Acronis Backup plugin for DirectAdminunspecified to before 1.2.3.238

References

CVE.org recordcve.org NVD entrynvd.nist.gov CISA KEV listingcisa.gov SEC-10986security-advisory.acronis.com