---
id: CVE-2026-87886
title: Local privilege escalation due to insecure file permissions
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,…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-276
vendor: acronis
product: acronis_backup
affected:
  - acronis_backup < 1.2.3
  - acronis_backup < 1.8.11
  - acronis_backup < 1.9.3
  - acronis_backup = 1.9.3
patched:
  - acronis_backup 1.9.3
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:29:35.067'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87886'
references:
  - url: 'https://security-advisory.acronis.com/advisories/SEC-10986'
    label: security@acronis.com
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87886
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://www.cisa.gov/know%20n-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87886
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - cve.org
  - exploit-available
epss: 0.00233
epssPercentile: 0.12683
kev: true
kevDateAdded: '2026-09-16'
kevDueDate: '2026-09-19'
kevRansomware: false
exploited: true
zeroDay: true
exploitAvailable: true
ssvc:
  exploitation: active
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-18T12:27:59.851837Z'
ingestedAt: '2026-09-17T23:31:20.688Z'
---

## Overview

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

- `acronis_backup < 1.2.3`
- `acronis_backup < 1.8.11`
- `acronis_backup < 1.9.3`
- `acronis_backup = 1.9.3`

## Remediation

Upgrade past the affected range:

- `acronis_backup 1.9.3`