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CVE-2026-87886

Status: AnalyzedHigh (7.8)⚠ Active exploitation

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.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

CISA KEV — actively exploited

Affected technologies (1)

Acronis — Acronis Backup

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-87886",
  "cveTags": [],
  "metrics": {
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          "options": [
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            },
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          ],
          "version": "2.0.3",
          "timestamp": "2026-09-18T12:27:59.851837Z"
        }
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          "userInteraction": "NONE",
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  ],
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  "cisaActionDue": "2026-09-19",
  "cisaExploitAdd": "2026-09-16",
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  "sourceIdentifier": "security@acronis.com",
  "cisaRequiredAction": "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.",
  "cisaVulnerabilityName": "Acronis Backup Incorrect Default Permissions Vulnerability"
}