CVE-2025-8995 is a critical authentication bypass vulnerability identified in the Drupal Authenticator Login module, specifically affecting versions prior to 2.1.4. The vulnerability is classified under CWE-288, which involves authentication bypass using an alternate path or channel. This means that an attacker can circumvent the normal authentication mechanisms by exploiting an unintended or alternate method of access within the Authenticator Login module. The vulnerability has a CVSS v3.1 base score of 9.8, indicating a critical severity level. The vector details (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) reveal that the attack can be executed remotely over the network without any privileges or user interaction, and it impacts confidentiality, integrity, and availability to a high degree. In practical terms, an attacker exploiting this flaw could gain unauthorized access to Drupal-based systems using the vulnerable Authenticator Login module, potentially leading to full system compromise, data theft, or disruption of services. The vulnerability affects the Authenticator Login module from version 0.0.0 up to but not including 2.1.4. No public exploits have been reported in the wild yet, but given the critical nature and ease of exploitation, this vulnerability poses a significant risk to organizations using Drupal with this module. The absence of patch links suggests that a fix may be pending or recently released, so immediate attention is required to update or mitigate the issue.

For European organizations, this vulnerability presents a severe risk, especially for those relying on Drupal CMS with the Authenticator Login module for their web applications or portals. Successful exploitation could lead to unauthorized access to sensitive data, including personal data protected under GDPR, intellectual property, and internal communications. The compromise of authentication mechanisms can also facilitate further lateral movement within networks, enabling attackers to escalate privileges or deploy ransomware. The high impact on confidentiality, integrity, and availability means that affected organizations could face operational disruptions, reputational damage, and regulatory penalties. Given the widespread use of Drupal in Europe across government, education, and private sectors, the potential for exploitation could affect critical infrastructure and services. Additionally, the lack of required privileges or user interaction for exploitation increases the likelihood of automated attacks or mass scanning campaigns targeting vulnerable systems.

European organizations should immediately verify if their Drupal installations use the Authenticator Login module and determine the version in use. If the version is prior to 2.1.4, they should prioritize upgrading to the latest patched version as soon as it becomes available. In the absence of an official patch, organizations should consider temporarily disabling the Authenticator Login module or restricting access to the authentication endpoints via network-level controls such as IP whitelisting or web application firewalls (WAFs) to block suspicious or unauthorized traffic. Implementing multi-factor authentication (MFA) at the application or infrastructure level can provide an additional security layer to mitigate the risk of authentication bypass. Continuous monitoring of authentication logs and anomaly detection can help identify potential exploitation attempts early. Organizations should also subscribe to Drupal security advisories and CVE databases to stay informed about patch releases and exploit developments. Finally, conducting a thorough security audit of Drupal configurations and access controls will help identify and remediate any other potential weaknesses.