CVE-2025-46658 is a vulnerability identified in the ExonautWeb component of the 4C Strategies Exonaut software version 21.6. The issue involves the generation of verbose error messages that potentially expose sensitive internal information about the application or its environment. Verbose error messages can reveal details such as file paths, database queries, software versions, stack traces, or configuration settings. Attackers can leverage this information to gain insights into the system architecture, identify further vulnerabilities, or craft more effective targeted attacks. Although the vulnerability does not specify the exact nature of the verbose output, such information disclosure weaknesses are commonly exploited during reconnaissance phases of cyberattacks. The vulnerability does not have an assigned CVSS score, no known exploits have been reported in the wild, and no patches or mitigations have been publicly documented at this time. The affected product, 4C Strategies Exonaut, is used for strategic planning and risk management, which may involve sensitive organizational data. The lack of detailed technical information and absence of a CVSS score limits the ability to fully assess exploitability or impact, but the presence of verbose error messages is generally considered a security weakness that can facilitate further attacks.

For European organizations using 4C Strategies Exonaut 21.6, this vulnerability could lead to unintended disclosure of sensitive internal information through error messages. This exposure can aid attackers in mapping the application environment, identifying additional vulnerabilities, or escalating attacks, potentially compromising confidentiality and integrity of organizational data. Given that Exonaut is often used in strategic and risk management contexts, the leakage of internal details could have reputational and operational impacts. While no direct exploitation or availability impact is indicated, the information disclosure could be a stepping stone for more severe attacks such as injection flaws, authentication bypass, or privilege escalation. European organizations in sectors such as government, defense, critical infrastructure, or large enterprises that rely on Exonaut for strategic planning may be particularly concerned about the confidentiality implications. The impact is heightened by the fact that no patches or mitigations are currently available, increasing the window of exposure.

Organizations should immediately review and harden the error handling and logging configurations within their ExonautWeb deployments to suppress verbose error messages from being displayed to end users or logged insecurely. This includes configuring the application to provide generic error messages that do not reveal internal details. Network segmentation and strict access controls should be enforced to limit exposure of the ExonautWeb interface to trusted users only. Monitoring and alerting on unusual application errors or access patterns can help detect exploitation attempts. Since no official patches are available, organizations should engage with 4C Strategies to obtain guidance or updates. Additionally, conducting a thorough security review and penetration testing of the Exonaut environment can identify other weaknesses that may be exploited in conjunction with this vulnerability. Implementing Web Application Firewalls (WAFs) with rules to block suspicious requests targeting error handling paths may provide temporary protection. Finally, educating users and administrators about the risks of information disclosure and secure error handling best practices is recommended.