CyberSecBulletin
CVE-2026-28727NVD status: Modified

Acronis Cyber Protect 17: Incorrect Default Permissions

Published Updated By the CyberSecBulletin desk

CVE-2026-28727 is a high-severity incorrect default permissions vulnerability in Acronis Cyber Protect 17 from Acronis, with a CVSS 3.0 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists version 41186 as the first without the flaw, so updating Acronis Cyber Protect 17 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.11% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Acronis Cyber Protect 17 to 41186 or a later version.
  2. Update Acronis Cyber Protect Cloud Agent to 41124 or a later version.
  3. Update Acronis True Image to 42902 or a later version.
  4. Read the advisory on security-advisory.acronis.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
AcronisAcronis Cyber Protect 17before 4118641186
AcronisAcronis Cyber Protect Cloud Agentbefore 4112441124
AcronisAcronis True Imagebefore 4290242902
AcronisAgentbefore c25.10c25.10
AcronisCyber Protectbefore 17.0.4118617.0.41186

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (acronis.com).

Official description

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, Acronis True Image (macOS) before build 42902.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Incorrect Default Permissions

During installation, installed file permissions are set to allow anyone to modify those files.

How developers prevent this class of flaw

  • The architecture needs to access and modification attributes for files to only those users who actually require those actions.
  • Compartmentalize the system to have safe areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

More Incorrect Default Permissions vulnerabilities (CWE-276)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Acronis Cyber Protect 17

All Acronis Cyber Protect 17 vulnerabilities

Recent Incorrect Default Permissions vulnerabilities

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