---
title: "CVE-2026-87886: Incorrect Default Permissions | CubePath"
description: "Local privilege escalation due to insecure file permissions. The following products are affected: Acronis Backup plugin for cPanel & WHM (Linux)…"
language: en
source: https://cubepath.com/security/cve/CVE-2026-87886
---

# CVE-2026-87886: Incorrect Default Permissions | CubePath

## 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.

Official description from the CVE record, published by Acronis. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-87886)

## Key data

### CVSS 3.0 High 7.8

Score published by Acronis in the CVE record.

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

| Metric                 | Value     | What it means                                                                             |
| ---------------------- | --------- | ----------------------------------------------------------------------------------------- |
| Attack vector          | Local     | The attacker needs local access to the system, or to trick a user into running something. |
| Attack complexity      | Low       | No special conditions are needed. The attack can be repeated at will.                     |
| Privileges required    | Low       | A basic user account is needed.                                                           |
| User interaction       | None      | No action from any user is needed.                                                        |
| Scope                  | Unchanged | The impact stays within the vulnerable component.                                         |
| Confidentiality impact | High      | Serious or total effect on the secrecy of data.                                           |
| Integrity impact       | High      | Serious or total effect on the trustworthiness of data.                                   |
| Availability impact    | High      | Serious or total effect on availability.                                                  |

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) .

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.00233 (0.2% probability)

Percentile

14.3%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog

Acronis Backup Incorrect Default Permissions Vulnerability

Added to the catalog

Sep 16, 2026

Federal due date

Sep 19, 2026

### CISA assessment as of Sep 18, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation

Recorded by CISA as active

Automatable

no

Technical impact

total

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-276](https://cwe.mitre.org/data/definitions/276.html) Incorrect Default Permissions

## Affected products

Products listed in the CVE record, as the CNA published them.

- Acronis Backup plugin for cPanel & WHM

  - affected: unspecified up to before 1.9.3.1021
- Acronis Backup extension for Plesk

  - affected: unspecified up to before 1.8.11.638
- Acronis Backup plugin for DirectAdmin

  - affected: unspecified up to before 1.2.3.238

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [SEC-10986](https://security-advisory.acronis.com/advisories/SEC-10986)  (security-advisory.acronis.com) vendor-advisory

## Timeline

1. ID reserved Sep 9, 2026
2. Added to CISA KEV Sep 16, 2026
3. Record published Sep 17, 2026
4. Record last updated Sep 18, 2026

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:51 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)