CVE-2026-82964 Avast Sandbox - Broken Access Control

Avast sandbox minifilter driver on Windows contains a broken access control vulnerability caused by improper preservation of file permissions in virtualization, letting local low-privileged attackers escape sandbox and escalate to SYSTEM, exploit requires local sandbox execution.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Privilege Escalation, Information Disclosure
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-281

Vendor fix

Update to the latest version with fixed permission handling in the sandbox minifilter driver.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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