Improper Link Resolution Vulnerability in Avira Internet Security

CVE-2026-27748

What is CVE-2026-27748?

CVE-2026-27748 is a vulnerability found in Avira Internet Security, a security software solution designed to protect users from various cyber threats, including malware, viruses, and online privacy risks. This specific vulnerability arises from an improper link resolution issue within the Software Updater component. During the update process, a privileged service that operates with SYSTEM-level permissions can delete files without properly validating the path, which may lead to malicious exploitation. An attacker could craft a symbolic link that redirects file deletion operations to arbitrary files on the system. This could allow the attacker to delete important files, perform local privilege escalation, or cause denial of service, significantly jeopardizing system integrity and data security for affected organizations.

Potential impact of CVE-2026-27748

1. Local Privilege Escalation: The vulnerability allows attackers to leverage SYSTEM privileges to manipulate critical files in the system without authorization, potentially leading to further exploitation and control over the system.

2. Denial of Service: By targeting essential system files for deletion, an attacker can disrupt the normal operations of the affected system, leading to service outages and interruptions in business activities.

3. Compromise of System Integrity: The ability to delete arbitrary files undermines the integrity of the system, as attackers can target crucial data or configuration files, which may lead to data loss or system instability.

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