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CISA KEV · ACTIVELY EXPLOITED
HIGH severity

CVE-2026-87886 — Acronis Backup

HIGH

CVE-2026-87886 is a high-severity (CVSS 7.8) Incorrect Default Permissions vulnerability in acronis acronis backup. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-09-16) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

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…

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 7, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-09-16. Federal agencies were required to remediate by 2026-09-19.
  • A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2026-87886.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs13th percentile — riskier than 13% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-87886 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 383,485 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

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.

Affected Products

1 product · 6 configurations
Application
acronis backupacronis
< 1.9.3
1 version
1.9.3

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every acronis acronis backup deployment and check each version against the affected-products list above.

  2. Fix

    Apply the acronis acronis backup security patch or hotfix for CVE-2026-87886 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

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.
O3 Security · Runtime Protection

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Detect and block the exploit chain at execution, on systems you cannot patch yet.

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CVE-2026-87886: Acronis Backup (High 7.8)