CVE-2026-87886
Acronis Backup Incorrect Default Permissions Vulnerability
Acronis Backup
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.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 16 September 2026. US federal agencies were required to remediate it by 19 September 2026.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 0.3%, which is higher than 17.3% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2026-87886 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2026-87886.
What does CVE-2026-87886 affect?
CVE-2026-87886 affects Acronis Backup. 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.
How severe is CVE-2026-87886?
CVE-2026-87886 is rated HIGH with a CVSS base score of 7.8. EPSS puts the probability of exploitation in the next 30 days at 0.3%, higher than 17.3% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 19 September 2026.
How should organisations respond to CVE-2026-87886?
Apply the vendor patch for Acronis Backup as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.