CVE-2025-9553 is a vulnerability identified in the Drupal API Key manager module, affecting all versions of this component. The vulnerability allows an unauthenticated attacker to remotely access certain confidential information related to API keys managed by Drupal. The CVSS 3.1 base score is 5.3, indicating a medium severity level, with the vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. This means the attack can be performed remotely over the network without any privileges or user interaction, and it impacts confidentiality only, without affecting integrity or availability. The vulnerability likely stems from improper access controls or information disclosure flaws within the API Key manager, allowing attackers to enumerate or retrieve API keys or related sensitive data. No known exploits have been reported in the wild, and no patches have been released yet, suggesting the vulnerability was recently disclosed. The Drupal API Key manager is commonly used to handle API credentials within Drupal-based websites and applications, making this vulnerability relevant for organizations relying on Drupal for web content management and API integrations. The exposure of API keys can lead to unauthorized access to backend services or third-party APIs, potentially enabling further attacks or data leakage. However, since the vulnerability does not allow modification or disruption of services, the immediate risk is limited to confidentiality breaches. The vulnerability was reserved in late August 2025 and published in October 2025, indicating a recent discovery and disclosure timeline.

For European organizations, the primary impact is the potential exposure of API keys managed by Drupal installations, which could lead to unauthorized access to connected services or data. This may result in data leakage or unauthorized use of APIs, potentially compromising sensitive business operations or customer data. Organizations in sectors such as government, finance, healthcare, and critical infrastructure that utilize Drupal for their web presence or API management are particularly at risk. The confidentiality breach could facilitate further attacks if attackers leverage exposed API keys to pivot into internal systems or third-party services. However, since the vulnerability does not affect integrity or availability, direct service disruption or data tampering is unlikely. The absence of known exploits reduces immediate threat levels but does not eliminate the risk of future exploitation. European entities with public-facing Drupal sites using the API Key manager should consider this vulnerability a moderate risk that requires timely remediation to prevent escalation.

1. Immediately restrict public access to the Drupal API Key manager endpoints by implementing network-level controls such as IP whitelisting or VPN access. 2. Monitor web server and application logs for unusual or unauthorized access attempts targeting API key management functions. 3. Apply strict access control policies within Drupal to limit who can view or manage API keys, ensuring only trusted administrators have permissions. 4. Use web application firewalls (WAF) to detect and block suspicious requests that may attempt to exploit this vulnerability. 5. Regularly audit API keys stored in Drupal and rotate them to invalidate potentially exposed credentials. 6. Stay alert for official Drupal security advisories and apply patches or updates as soon as they become available. 7. Consider isolating API key management functionality from public-facing systems or using external secure vault solutions for API key storage. 8. Educate administrators on the risks of API key exposure and best practices for secure key management.