CVE-2024-7487 is an improper authentication vulnerability (CWE-287) identified in WSO2 Identity Server version 7.0.0. The flaw arises from an implementation error in the app-native authentication mechanism, where passing an invalid object allows attackers to bypass client verification. This bypass undermines the authentication process's integrity, enabling unauthorized access without valid credentials or proper authentication checks. The vulnerability does not require any privileges or user interaction to exploit and can be triggered remotely over the network. The CVSS v3.1 base score is 5.8 (medium severity), reflecting a network attack vector with low attack complexity, no privileges required, no user interaction, and a scope change, where the integrity of the system is compromised but confidentiality and availability remain unaffected. Although no known exploits are currently reported in the wild, the vulnerability poses a significant risk to environments relying on WSO2 Identity Server 7.0.0 for identity and access management, as it could allow attackers to impersonate clients or users, potentially leading to unauthorized access to sensitive applications and services integrated with the identity server.

For European organizations, the impact of this vulnerability can be substantial, especially for those using WSO2 Identity Server 7.0.0 as a core component of their identity and access management infrastructure. Successful exploitation could lead to unauthorized access to internal applications, cloud services, and sensitive data, undermining trust in authentication processes. This could result in data integrity issues, unauthorized transactions, and potential lateral movement within corporate networks. Given the critical role of identity servers in federated authentication and single sign-on (SSO) environments, exploitation could also affect multiple connected systems, amplifying the risk. Organizations in regulated sectors such as finance, healthcare, and government may face compliance violations and reputational damage if this vulnerability is exploited. Additionally, the medium severity score suggests that while the vulnerability is not trivial, it is accessible enough to warrant immediate attention to prevent potential compromise.

To mitigate this vulnerability, European organizations should prioritize upgrading or patching WSO2 Identity Server to a version where this flaw is resolved once a patch is available. In the interim, organizations should implement strict network segmentation and access controls to limit exposure of the identity server to untrusted networks. Employing Web Application Firewalls (WAFs) with custom rules to detect and block anomalous authentication requests may reduce exploitation risk. Monitoring authentication logs for unusual patterns or failed authentication attempts involving invalid objects can help detect exploitation attempts early. Additionally, organizations should review and harden client verification mechanisms and consider multi-factor authentication (MFA) to add an extra layer of security beyond the vulnerable native authentication. Regular security assessments and penetration testing focused on identity management components are recommended to identify and remediate related weaknesses.