CVE-2026-87886

HIGHCVSS 7.8Known Exploited

CISA Known Exploited Vulnerability

https://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

Remediation deadline: September 19, 2026

Description

Acronis Backup plugin for cPanel & WHM and extension for Plesk contains an incorrect default permissions vulnerability that could allow for privilege escalation.

Timeline

Published:September 17th, 2026 11:18 PM

Last modified:September 18th, 2026 7:29 PM

Added to KEV:September 16th, 2026

CVSS Scoring

CVSS v3: 7.8 (HIGH)

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

Affected Software

From NVD CPE configuration data

Vendors

acronis

Products

acronis_backup

Weaknesses (CWE)

CWE-276

References & Reports

Advisories, patches, and third-party reports

Source: NIST NVD · Data may lag official sources by up to one minute