CVE-2026-87886
KEV: known exploited SSVC: activeCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.0 vector| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | L | Local |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | L | Regular user |
| User interaction UI | N | None |
| Scope S | U | Unchanged |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
CISA KEV entry
Acronis Backup Incorrect Default Permissions Vulnerability — Acronis / Backup
Acronis Backup plugin for cPanel & WHM and extension for Plesk contains an incorrect default permissions vulnerability that could allow for privilege escalation.
Required 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.
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
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 3.0 | 7.8 HIGH | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CNA / Acronis | 3.0 | 7.8 HIGH | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| Acronis | Acronis Backup plugin for cPanel & WHM | affected: unspecified … < 1.9.3.1021 default: unaffected |
| Acronis | Acronis Backup extension for Plesk | affected: unspecified … < 1.8.11.638 default: unaffected |
| Acronis | Acronis Backup plugin for DirectAdmin | affected: unspecified … < 1.2.3.238 default: unaffected |
NVD CPE (6)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| acronis | acronis_backup | < 1.2.3 | cpe:2.3:a:acronis:acronis_backup:*:*:*:*:*:directadmin:*:* |
| acronis | acronis_backup | < 1.8.11 | cpe:2.3:a:acronis:acronis_backup:*:*:*:*:*:plesk:*:* |
| acronis | acronis_backup | < 1.9.3 | cpe:2.3:a:acronis:acronis_backup:*:*:*:*:*:cpanel:*:* |
| acronis | acronis_backup | cpe:2.3:a:acronis:acronis_backup:1.9.3:-:*:*:*:cpanel:*:* | |
| acronis | acronis_backup | cpe:2.3:a:acronis:acronis_backup:1.9.3:hotfix1:*:*:*:cpanel:*:* | |
| acronis | acronis_backup | cpe:2.3:a:acronis:acronis_backup:1.9.3:hotfix2:*:*:*:cpanel:*:* |
Linux distribution status
References (2)
- https://security-advisory.acronis.com/advisories/SEC-10986 NVD, CNA Vendor Advisoryvendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87886 NVD, ADP CISA-ADP US Government Resourceexploit