CVE-2026-57239 in PDF Editor
Summary
by MITRE • 07/08/2026
The user-controllable executable files will be directly executed by high-privilege processes, allowing low-privilege users to have the opportunity to elevate their privileges to NT AUTHORITY\SYSTEM.
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Analysis
by VulDB Data Team • 07/08/2026
This vulnerability represents a critical privilege escalation flaw that occurs when high-privilege processes execute user-controllable executable files without proper input validation or privilege separation mechanisms. The technical foundation of this issue lies in the improper handling of external inputs within privileged execution contexts, creating an attack vector where low-privileged users can manipulate executable files to gain elevated system privileges. This type of vulnerability aligns with CWE-78 and CWE-423, which specifically address improper input validation and untrusted input handling in security-critical processes. The flaw typically manifests when system processes that run with administrative or SYSTEM privileges directly invoke user-supplied command-line arguments or executable paths without sanitizing or validating the inputs against malicious modifications. Attackers can exploit this weakness by placing malicious executables in locations that will be accessed by high-privilege processes or by manipulating symbolic links, file paths, or environment variables to redirect execution flow toward crafted malicious payloads.
The operational impact of such a vulnerability is severe and far-reaching within enterprise environments where privilege separation is assumed. When low-privileged users successfully exploit this flaw, they can achieve full SYSTEM-level control over affected systems, enabling them to bypass all standard security controls including user access controls, file permissions, and application whitelisting mechanisms. This privilege escalation allows attackers to perform actions such as installing persistent backdoors, exfiltrating sensitive data, modifying system configurations, or establishing footholds for lateral movement throughout the network infrastructure. The vulnerability essentially undermines the fundamental principle of least privilege that security architectures rely upon, potentially leading to complete system compromise and unauthorized access to critical organizational assets. From an ATT&CK framework perspective, this represents a privilege escalation technique under T1068, specifically targeting the exploitation of process execution vulnerabilities to gain elevated privileges.
Mitigation strategies for this vulnerability must focus on implementing proper input validation, privilege separation, and secure coding practices within system processes that handle user-controllable inputs. Organizations should enforce strict file path validation to prevent execution of unauthorized binaries, implement proper access controls using mandatory access controls or security descriptors, and ensure that privileged processes run with the minimum required privileges to perform their functions. Additionally, implementing application whitelisting solutions, enabling Windows Defender Application Control, and regularly auditing process execution flows can significantly reduce the attack surface. System administrators should also monitor for unusual process execution patterns and implement proper logging mechanisms to detect potential exploitation attempts. The remediation approach must include thorough code reviews of all privileged processes that handle external inputs, implementation of secure file handling practices such as using absolute paths with proper validation, and ensuring that symbolic links and junctions are properly secured against manipulation by unprivileged users. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other system components that may present analogous privilege escalation risks.