What is the CVSS score of CVE-2026-28727?

CVE-2026-28727 has a CVSS 3.0 base score of 7.8 (High). CVSS vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-28727?

Within 24 hours: Inventory all macOS systems running Acronis Cyber Protect 17 (before build 41186) or Cloud Agent (before build 41124) and assess user access patterns. Within 7 days: Implement network access controls to limit local privilege escalation pathways and monitor for suspicious privilege escalation attempts. Within 30 days: Apply available vendor updates or transition to patched builds (41186+ for Cyber Protect 17, 41124+ for Cloud Agent); prioritize systems with multi-user access.

Cyber Protect CVE-2026-28727

HIGH

Incorrect Default Permissions (CWE-276)

2026-03-06 security@acronis.com

Privilege Escalation Apple Agent Cyber Protect Acronis

7.8

CVSS 3.0 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Local user gains access to system
Exploit

Identify insecure Unix socket permissions
Execution

Connect to privileged socket
Impact

Execute commands as root

Vulnerability Assessment

Weakness	CWE CWE-276 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V13 - Configuration Default permission hardening MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Local user account required on macOS system running Acronis Cyber Protect 17 (build <41186) or Acronis Cyber Protect Cloud Agent (build <41124) with insecurely configured Unix socket permissions allowing unprivileged process access.
Impact	CVSS 7.8 (HIGH). Attack vector: Local. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via local access.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Acronis Cyber Protect and Cloud Agent on macOS before specific builds contain an insecure Unix socket permissions vulnerability that allows local authenticated users to escalate privileges and gain complete system control. An attacker with local access can exploit this misconfiguration to read sensitive data, modify system files, and execute arbitrary commands with elevated rights. No patch is currently available for this HIGH severity vulnerability.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:06 CVSS 7.8

Local privilege escalation due to insecure Unix socket permissions. The following products are affected: Acronis Cyber Protect 17 (macOS) before build 41186, Acronis Cyber Protect Cloud Agent (macOS) before build 41124. [CVSS 7.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-276 (Incorrect Default Permissions). Local privilege escalation due to insecure Unix socket permissions. The following products are affected: Acronis Cyber Protect 17 (macOS) before build 41186, Acronis Cyber Protect Cloud Agent (macOS) before build 41124.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

Executive ViewAI

Why It Matters

A local privilege escalation vulnerability in Acronis Cyber Protect products on macOS could allow authenticated users to gain elevated system access, potentially compromising backup integrity and sensitive data. Organizations using affected versions on macOS endpoints face elevated risk until remediation is completed.

Business Impact: High

Compensating Controls

Restrict local system access to trusted administrators only; implement endpoint detection and response (EDR) monitoring for privilege escalation attempts; disable Acronis backup services on lower-trust macOS endpoints until patched; enforce strict file permissions on Unix sockets through system hardening; isolate affected systems from critical networks where feasible.

Threat Intelligence Overview

EPSS Score

0.0%

Top 98% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +39

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.