CVE-2026-57262 in LOGO! Soft Comfort
Summary
by MITRE • 08/11/2026
A vulnerability has been identified in LOGO! Soft Comfort (All versions < V9). Affected products use a static, hardcoded AES master key to encrypt project files. This could allow a local attacker to extract the master key from the application files or memory and use it to decrypt project files or remove project passwords entirely without knowing the actual user-defined password.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability resides in LOGO! Soft Comfort software versions prior to V9 where the developers implemented a static and hardcoded AES master key for encrypting project files. The flaw represents a fundamental cryptographic weakness that directly violates security best practices and industry standards such as those outlined in CWE-327, which addresses the use of weak or broken cryptographic algorithms. The hardcoded nature of this master key means that it is embedded within the application binaries or configuration files, making it accessible to any local attacker who can gain sufficient access to examine the software components.
The technical implementation of this vulnerability stems from the application's failure to properly manage cryptographic keys through secure key derivation functions or hardware security modules. Instead of generating unique encryption keys for each project or utilizing a proper key management infrastructure, the software relies on a single, persistent master key that remains constant across all installations and project files. This design choice creates an attack surface where adversaries can potentially extract this key from memory dumps, application files, or through reverse engineering techniques.
The operational impact of this vulnerability is significant for users who rely on LOGO! Soft Comfort for industrial automation projects where security and data integrity are paramount. Local attackers with access to the system can exploit this weakness to decrypt sensitive project files that were previously protected by user-defined passwords. This effectively bypasses the authentication mechanisms, allowing unauthorized access to potentially critical control logic and configuration data. The vulnerability essentially renders password protection meaningless since the same master key can be used to decrypt all project files regardless of individual user passwords.
From an attack perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the T1552 category for "Unsecured Credentials" and potentially T1003 for "OS Credential Dumping" if attackers can extract keys from memory. The exploitation process typically involves static analysis of application binaries or dynamic analysis through memory examination to locate and extract the hardcoded key. Once obtained, this key can be used to decrypt any project files created with the affected software versions.
Mitigation strategies should focus on immediate remediation through updating to LOGO! Soft Comfort V9 or later, which presumably addresses this cryptographic weakness through proper key management implementation. Organizations should also conduct comprehensive audits of their industrial control systems to identify all instances of affected software versions and ensure that project files are not stored in locations accessible to unauthorized local users. Additionally, implementing network segmentation and access controls can help limit the potential damage from local privilege escalation attacks. The vulnerability highlights the critical importance of following secure coding practices and proper cryptographic implementation as outlined in NIST SP 800-57 for managing cryptographic keys throughout their lifecycle.