CVE-2026-87886
Prioritize patching. It under exploitation confirmed by CISA and has a public proof of concept.
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.
A local privilege escalation vulnerability exists in Acronis Backup plugins for cPanel, Plesk, and DirectAdmin due to insecure file permissions. An attacker with local access could exploit this to gain elevated privileges on the affected system.
The vulnerability stems from improper file permissions (CWE-276) in the Acronis Backup plugins for Linux-based hosting control panels. A local attacker can leverage these insecure permissions to escalate privileges from a lower-privileged user context to a higher privilege level. Affected versions: cPanel & WHM before 1.9.3.1021, Plesk before 1.8.11.638, and DirectAdmin before 1.2.3.238.