CVE-2026-18605 in AppCheck Pro
Summary
by MITRE • 08/03/2026
A security flaw has been discovered in CheckMAL AppCheck Pro 3.1.43.10. Affected is an unknown function in the library AppCheckD.sys of the component Kernel Mini-Filter Driver. Performing a manipulation results in uncontrolled search path. The attack requires a local approach. The complexity of an attack is rather high. The exploitability is told to be difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 08/03/2026
The security vulnerability identified in CheckMAL AppCheck Pro 3.1.43.10 represents a critical flaw within the kernel mini-filter driver component, specifically within the AppCheckD.sys library. This type of vulnerability falls under the category of improper control of a resource during an access attempt, which aligns with CWE-255. The affected system component operates at the kernel level, making it particularly dangerous as it can potentially bypass user-mode protections and directly interact with system resources. The vulnerability manifests through an uncontrolled search path manipulation that occurs when the driver processes certain inputs or requests.
The technical implementation of this flaw involves a path traversal or search path manipulation issue where the kernel mini-filter driver fails to properly validate or control the paths it uses during file operations or resource access. This creates opportunities for malicious actors to influence the driver's behavior by manipulating how it resolves file locations or system resources. The vulnerability requires local system access, which means an attacker must already have user-level privileges on the target system to exploit this weakness. However, the high complexity and difficulty of exploitation suggest that additional conditions or prerequisites are necessary for successful exploitation.
From an operational perspective, this vulnerability poses significant risks to system integrity and security. When exploited successfully, it could allow an attacker to manipulate the behavior of the kernel filter driver, potentially leading to privilege escalation, unauthorized code execution, or complete system compromise. The fact that a public exploit exists increases the likelihood of real-world attacks against vulnerable systems. The attack vector requires local access, which limits its scope compared to network-based vulnerabilities but still represents a serious threat given that attackers can gain local access through various means such as social engineering, phishing, or physical access.
The security implications extend beyond immediate exploitation capabilities into broader system protection concerns. Kernel-level vulnerabilities of this nature are particularly concerning because they operate below the level of standard user-mode protections and can potentially provide attackers with elevated privileges or backdoor access to the underlying operating system. The lack of vendor response after early disclosure indicates possible delays in patch development or potential denial-of-service concerns related to the vulnerability. This vulnerability aligns with attack techniques described in the MITRE ATT&CK framework under privilege escalation and persistence tactics, specifically targeting kernel-mode components that can provide sustained access to systems.
Mitigation strategies should focus on immediate patching if available, though the vendor's lack of response suggests this may not be readily available. System administrators should implement additional monitoring for suspicious driver behavior, particularly around the AppCheckD.sys component. The principle of least privilege should be enforced to limit local user access where possible. Regular security assessments and vulnerability scanning should include checks for kernel-level components and their interaction with system resources. Additionally, maintaining up-to-date system monitoring tools that can detect anomalous behavior in kernel drivers will help identify potential exploitation attempts before they result in successful compromises. The vulnerability demonstrates the importance of proper input validation and resource control in kernel-mode drivers, emphasizing the need for security-by-design principles in system-level software components.