CVE-2025-54786 is a medium severity vulnerability affecting SuiteCRM-Core versions 7.14.6 up to but not including 7.14.7, and versions 8.8.0 up to but not including 8.8.1. SuiteCRM is an open-source Customer Relationship Management (CRM) platform widely used by enterprises for managing customer data and interactions. The vulnerability arises from broken authentication in the legacy iCal service component, which is responsible for calendar event synchronization and management. Specifically, this flaw allows an unauthenticated attacker to access meeting data of any user by simply knowing their username. This results in unauthorized exposure of sensitive calendar event information without requiring any authentication or user interaction. Additionally, the vulnerability facilitates user enumeration through related functionality, enabling attackers to discover valid usernames on the system. The vulnerability is classified under CWE-200 (Exposure of Sensitive Information), CWE-284 (Improper Access Control), and CWE-287 (Improper Authentication). The CVSS v3.1 base score is 5.3, reflecting a medium severity level, with an attack vector of network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and impact limited to confidentiality (C:L) without affecting integrity or availability. No known exploits have been reported in the wild as of the publication date, and the issue is resolved in SuiteCRM versions 7.14.7 and 8.8.1. Organizations running affected versions should prioritize upgrading to the patched releases to mitigate unauthorized data exposure risks.

For European organizations, this vulnerability poses a risk of unauthorized disclosure of sensitive meeting and calendar information, which may include confidential business discussions, strategic plans, or personally identifiable information (PII). Exposure of such data can lead to privacy violations under GDPR, reputational damage, and potential competitive disadvantage. Since SuiteCRM is often used by SMEs and larger enterprises across various sectors including finance, healthcare, and public administration, the unauthorized access to calendar data could facilitate further targeted attacks such as social engineering, spear phishing, or insider threat exploitation. The user enumeration capability also aids attackers in mapping valid user accounts, increasing the risk of subsequent credential-based attacks. Although the vulnerability does not allow modification or deletion of data, the confidentiality breach alone can have significant compliance and operational impacts. Given the network-exploitable nature and lack of authentication requirements, attackers can remotely exploit this vulnerability without needing internal access or user interaction, increasing the attack surface for organizations with externally accessible SuiteCRM instances.

European organizations should immediately verify their SuiteCRM version and upgrade to 7.14.7 or 8.8.1 or later to apply the official patches that fix the broken authentication in the iCal service. If immediate patching is not feasible, organizations should restrict external access to the iCal service endpoints via network segmentation or firewall rules, limiting access to trusted internal IP ranges only. Implementing Web Application Firewalls (WAFs) with custom rules to detect and block unauthenticated requests targeting calendar data can provide temporary protection. Additionally, organizations should audit user account naming conventions and consider rate limiting or monitoring for anomalous requests that could indicate user enumeration attempts. Regularly reviewing access logs for suspicious activity related to calendar endpoints is recommended. Finally, organizations should ensure that SuiteCRM deployments follow security best practices, including disabling legacy or unused services like the iCal service if not required, and enforcing strong authentication and access controls on CRM interfaces.