CVE-2026-87886

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-87886
StatePUBLISHED
AssignerAcronis
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 23:18:53 UTC
Updated2026-09-18 19:29:35 UTC
DescriptionLocal 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.

Risk And Classification

Primary CVSS: v3.0 7.8 HIGH from [email protected]

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

EPSS: 0.002540000 probability, percentile 0.173510000 (date 2026-09-19)

CISA KEV: Listed on 2026-09-16; due 2026-09-19; ransomware use Unknown

Problem Types: CWE-276 | CWE-276 CWE-276

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary7.8HIGHCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.0CNACVSS7.8HIGHCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CISA Known Exploited Vulnerability

VendorAcronis
ProductBackup
NameAcronis Backup Incorrect Default Permissions Vulnerability
Required ActionApply 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.
Noteshttps://security-advisory.acronis.com/advisories/SEC-10986 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-87886

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Acronis Acronis Backup All All All All
Application Acronis Acronis Backup All All All All
Application Acronis Acronis Backup All All All All
Application Acronis Acronis Backup 1.9.3 - All All
Application Acronis Acronis Backup 1.9.3 hotfix1 All All
Application Acronis Acronis Backup 1.9.3 hotfix2 All All
Operating System Linux Linux Kernel - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Acronis Acronis Backup Plugin For CPanel WHM affected unspecified 1.9.3.1021 semver Linux
CNA Acronis Acronis Backup Extension For Plesk affected unspecified 1.8.11.638 semver Linux
CNA Acronis Acronis Backup Plugin For DirectAdmin affected unspecified 1.2.3.238 semver Linux

References

ReferenceSourceLinkTags
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
security-advisory.acronis.com/advisories/SEC-10986 [email protected] security-advisory.acronis.com Vendor Advisory
www.cisa.gov/know%20n-exploited-vulnerabilities-catalog MITRE www.cisa.gov
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

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