KEV / Record
CVE-2026-87886: Acronis Backup Incorrect Default Permissions Vulnerability
Answer CVE-2026-87886 is in CISA's Known Exploited Vulnerabilities catalog. It was added on 2026-09-16, and US federal civilian agencies must act on it by 2026-09-19.
DCISA description
Acronis Backup plugin for cPanel & WHM and extension for Plesk contains an incorrect default permissions vulnerability that could allow for privilege escalation.
ARequired action
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.
RNotes and references
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
FRecord
- CVE
- CVE-2026-87886
- Vendor
- Acronis (2 entries in KEV)
- Product
- Backup (1 entry)
- Added to KEV
- Federal due date
- Past due date (2026-09-19)
- Remediation window
- 3 days
- Known ransomware use
- Unknown (not confirmed by CISA)
VOther Acronis entries in KEV
| CVE | Product | Added | Ransomware |
|---|---|---|---|
| CVE-2023-45249 | Cyber Infrastructure (ACI) | Unknown |
This record repeats CISA's entry and is excluded from search indexes until an analyst note is added.
Source: CISA KEV catalog v2026.09.23, released 2026-09-23. Windows end 2026-09-23.