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CVE-2026-87886 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87886	CISA-ADP	US Government Resource
https://security-advisory.acronis.com/advisories/SEC-10986	[email protected]	Vendor Advisory

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.

Vulnerability Name	Date Added	Due Date	Required Action
Acronis Backup Incorrect Default Permissions Vulnerability	Sep 16, 2026	Sep 19, 2026	Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-276	Incorrect Default Permissions	[email protected]

Affected Products

Product	Versions
acronis acronis backup	< 1.2.3 < 1.8.11 < 1.9.3 1.9.3 - 1.9.3 hotfix1
CPE cpe:2.3:a:acronis:acronis_backup::::::directadmin::* cpe:2.3:a:acronis:acronis_backup::::::plesk::* cpe:2.3:a:acronis:acronis_backup::::::cpanel::* cpe:2.3:a:acronis:acronis_backup:1.9.3:-::::cpanel::* cpe:2.3:a:acronis:acronis_backup:1.9.3:hotfix1::::cpanel::* cpe:2.3:a:acronis:acronis_backup:1.9.3:hotfix2::::cpanel::* Remediation No remediation found in references.
linux linux kernel	All versions
CPE cpe:2.3:o:linux:linux_kernel:-:::::::* Remediation No remediation found in references.

Change History

7 change records found show changes

Date	Action	Recorded By
Sep 18, 2026	Modified Analysis	[email protected]
Sep 18, 2026	CVE Modified	CISA-ADP
Sep 18, 2026	CVE Modified	CISA-ADP
Sep 18, 2026	Initial Analysis	[email protected]
Sep 18, 2026	CVE CISA KEV Update	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government
Sep 18, 2026	CVE Modified	[email protected]
Sep 17, 2026	New CVE Received	[email protected]