CVE-2026-0948 is a vulnerability categorized under CWE-288, indicating an authentication bypass via an alternate path or channel in the Microsoft Entra ID SSO Login module for Drupal. This module facilitates single sign-on (SSO) by integrating Microsoft Entra ID (formerly Azure AD) authentication into Drupal websites. The vulnerability exists in versions before 1.0.4 and allows attackers to circumvent the standard authentication process by exploiting an alternate access route that is insufficiently protected. This bypass leads to privilege escalation, granting unauthorized users elevated permissions within the Drupal environment. The flaw undermines the authentication mechanism, potentially allowing attackers to impersonate legitimate users or administrators without valid credentials. Although no public exploits have been reported, the vulnerability's nature suggests it could be leveraged in targeted attacks against organizations relying on this SSO integration. The absence of a CVSS score indicates the vulnerability is newly disclosed, but its characteristics—authentication bypass and privilege escalation—imply significant risk. The vulnerability affects confidentiality and integrity by enabling unauthorized access and control, and potentially availability if attackers misuse elevated privileges to disrupt services. The technical details confirm the vulnerability was reserved in January 2026 and published in February 2026, with no patch links currently available, emphasizing the need for prompt vendor response and user vigilance.

For European organizations, especially those using Drupal CMS integrated with Microsoft Entra ID for SSO, this vulnerability poses a serious risk. Successful exploitation can lead to unauthorized access to sensitive data, administrative control over websites, and potential lateral movement within internal networks. This is particularly critical for sectors such as government, finance, healthcare, and critical infrastructure, where Drupal is commonly used for public-facing portals and intranet services. The breach of authentication mechanisms can compromise user data privacy, violate GDPR compliance, and damage organizational reputation. Moreover, attackers gaining elevated privileges could deploy further malware, exfiltrate data, or disrupt services, impacting business continuity. The lack of known exploits currently reduces immediate risk but does not diminish the urgency for mitigation, as threat actors may develop exploits rapidly once the vulnerability details are public. European organizations with complex identity federation setups relying on Microsoft Entra ID SSO are especially vulnerable due to the central role of authentication in their security posture.

Organizations should prioritize updating the Microsoft Entra ID SSO Login module for Drupal to version 1.0.4 or later once it is released by the vendor, as this will contain the necessary patches to close the authentication bypass. Until an official patch is available, administrators should consider temporarily disabling the affected SSO integration or implementing additional access controls and monitoring around authentication flows. Conduct thorough audits of authentication paths to identify and block any alternate channels that could be exploited. Employ multi-factor authentication (MFA) at the identity provider level to reduce the risk of unauthorized access even if the bypass is attempted. Monitor logs for unusual authentication attempts or privilege escalations, and implement network segmentation to limit the impact of compromised accounts. Engage with Drupal and Microsoft security advisories regularly to stay informed on updates. Finally, conduct penetration testing focused on SSO mechanisms to detect similar weaknesses proactively.