CVE entry · CVE-2026-87886
CVE-2026-87886: Acronis Backup Incorrect Default Permissions Vulnerability
Acronis Backup plugin for cPanel & WHM and extension for Plesk contains an incorrect default permissions vulnerability that could allow for privilege escalation.
- Actively exploited: added to CISA’s KEV catalog on September 16, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: September 19, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Acronis Backup, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (security-advisory.acronis.com)
- NVD entry (NIST)
- CISA KEV catalog