Local Privilege Escalation in Acronis cPanel Backup Plugin (CVE‑2026‑87886) Exploited in the Wild
What It Is – Acronis disclosed a high‑severity flaw (CVE‑2026‑87886, CVSS 7.8) in its Backup plugin for cPanel & WHM that allows a local attacker to elevate privileges by exploiting insecure file permissions.
Exploitability – The vulnerability is already being leveraged in targeted attacks; public exploits and proof‑of‑concept code have been observed.
Affected Products – Acronis Backup plugin for cPanel & WHM (Linux) – all versions prior to the emergency patch released on 2026‑09‑10.
Why It Matters for Trust & Control Assurance
- Demonstrates the need for continuous verification that file‑system permissions align with the principle of least privilege – a core access‑control objective across most frameworks.
- Unpatched privilege escalation creates gaps in audit trails, making it harder to prove “who did what” during a security review.
- Enterprise buyers increasingly demand evidence that hosting environments are continuously monitored for configuration drift and that remediation is documented in a defensible trust‑center.
Recommended Actions
- Apply Acronis’s emergency patch immediately and verify the plugin version.
- Conduct a systematic review of file‑permission settings on all cPanel/WHM servers; enforce least‑privilege defaults.
- Enable continuous monitoring of permission changes and integrate alerts into your SIEM or control‑assurance dashboard.
- Document the remediation steps and retain logs as audit evidence for future compliance assessments.
Source: The Hacker News – Acronis cPanel Backup Plugin Vulnerability Exploited in Targeted Attacks