CVE-2025-9552 identifies a vulnerability in the Drupal module 'Synchronize composer.json With Contrib Modules,' which is used to synchronize the composer.json file with contributed modules in Drupal installations. This vulnerability affects all versions of the module, indicating a design or implementation flaw present throughout its lifecycle. The CVSS 3.1 base score of 5.3 classifies it as medium severity, with the vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. This means the vulnerability can be exploited remotely over the network without any privileges or user interaction, and it impacts confidentiality only, with no effect on integrity or availability. The exact technical details of the flaw are not provided, but the impact suggests unauthorized access to some sensitive information related to the composer.json synchronization process. No known exploits have been reported in the wild, and no patches or mitigations have been linked yet. The vulnerability was reserved in late August 2025 and published in October 2025, indicating recent discovery. Given the module's role in managing dependencies and module synchronization, attackers could potentially glean information about the Drupal environment or configuration, which could aid further attacks. However, the lack of integrity or availability impact limits the scope of damage. The vulnerability is relevant to all Drupal installations using this module, which is common in environments that rely on composer for dependency management.

For European organizations, this vulnerability poses a moderate risk primarily to the confidentiality of configuration data within Drupal environments. Exposure of composer.json synchronization details could reveal module versions, dependencies, or environment specifics that attackers might leverage for targeted attacks or privilege escalation. While the vulnerability does not directly affect integrity or availability, the information disclosure could facilitate subsequent exploitation steps. Organizations running public-facing Drupal websites or intranet portals using this module are at risk, especially if external access is unrestricted. The impact is more pronounced for entities with sensitive data or critical web services hosted on Drupal, such as government agencies, financial institutions, and large enterprises. The absence of known exploits reduces immediate risk but does not eliminate the need for proactive mitigation. Failure to address this vulnerability could lead to reconnaissance by threat actors, increasing the likelihood of more severe attacks in the future.

Organizations should immediately inventory their Drupal environments to identify installations using the 'Synchronize composer.json With Contrib Modules' module. Until an official patch is released, restrict network access to Drupal administrative interfaces and related endpoints to trusted internal IPs only. Implement strict web application firewall (WAF) rules to detect and block suspicious requests targeting composer.json synchronization functionality. Regularly monitor Drupal security advisories and community channels for patch releases or mitigation updates. Employ vulnerability scanning tools capable of detecting this specific module and its versions. Consider disabling or removing the module if it is not essential to operations. Additionally, conduct security awareness training for administrators to recognize potential exploitation attempts. For environments with high security requirements, perform manual code reviews or penetration testing focused on this module's synchronization features to identify any exploitable weaknesses.