CVE-2025-71326

HIGH 7.8

AVAST Antivirus 25.11 Unquoted Service Path Privilege Escalation

CVSS Score

7.8

EPSS Score

0.0%

EPSS Percentile

0th

AVAST Antivirus 25.11 contains an unquoted service path vulnerability in the SecureLine service that allows local non-privileged users to execute code with elevated SYSTEM privileges. Attackers can exploit the unquoted binary path in the service configuration to inject malicious executables that execute with high-level system permissions.

CWE	CWE-428
Vendor	avast
Product	avast antivirus
Published	Jun 19, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Avast / AVAST Antivirus

25.11

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/52510 avast.com: https://www.avast.com/ vulncheck.com: https://www.vulncheck.com/advisories/avast-antivirus-unquoted-service-path-privilege-escalation

Credits

Milad Karimi (Ex3ptionaL)