CVE-2025-7326 in ASP.NET Core
Summary
by MITRE • 07/08/2025
Weak authentication in EOL ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
NOTE: This CVE affects only End Of Life (EOL) software components. The vendor, Microsoft, has indicated there will be no future updates nor support provided upon inquiry.
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Analysis
by VulDB Data Team • 07/22/2025
This vulnerability represents a critical authentication weakness in legacy Microsoft ASP.NET Core implementations that have reached their end-of-life status. The flaw stems from insufficient credential verification mechanisms within the framework's authentication subsystem, creating opportunities for malicious actors to bypass normal access controls and gain unauthorized administrative privileges. The vulnerability specifically impacts systems running deprecated versions of ASP.NET Core where Microsoft has ceased all security updates and support activities. This weakness operates at the application layer of the network stack, exploiting fundamental flaws in how the framework validates user credentials and session management. The authentication bypass occurs through improper validation of authentication tokens or session identifiers, allowing attackers to manipulate the authentication flow and assume elevated privileges without proper authorization.
The technical implementation of this vulnerability demonstrates a failure in the authentication protocol handling within the ASP.NET Core framework. Attackers can exploit this weakness by crafting malicious requests that either reuse valid tokens, manipulate authentication parameters, or exploit timing vulnerabilities in session validation. The flaw typically manifests when the application fails to properly validate the integrity of authentication data or when it relies on insecure default configurations that do not adequately protect against credential manipulation attacks. This vulnerability operates under the broader category of weak authentication mechanisms that align with CWE-305 and CWE-287, which specifically address authentication flaws and improper authentication implementations. The vulnerability can be exploited through network-based attacks where attackers intercept and manipulate authentication flows, potentially leading to complete system compromise.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to gain unauthorized access to sensitive application data, modify system configurations, and potentially establish persistent access points within the network infrastructure. Systems affected by this vulnerability become prime targets for lateral movement attacks, where initial unauthorized access can be leveraged to compromise additional network resources. The risk is particularly elevated in environments where legacy ASP.NET Core applications handle sensitive data processing or serve as critical backend services. Organizations running unsupported software versions face significant exposure as there are no vendor-provided patches or updates available to address this weakness. This vulnerability can facilitate data breaches, service disruption, and compliance violations, particularly in regulated environments where proper authentication controls are mandatory.
Mitigation strategies for this vulnerability are limited due to the end-of-life status of the affected software components, but organizations should implement immediate network-level controls to reduce exposure. Network segmentation and access controls should be enforced to limit connectivity to affected systems, while monitoring solutions should be deployed to detect anomalous authentication patterns or unauthorized access attempts. Organizations should consider implementing additional authentication layers such as multi-factor authentication or external identity providers to compensate for the weakened authentication within the legacy framework. The implementation of web application firewalls and intrusion detection systems can help detect and block exploitation attempts targeting this specific weakness. According to ATT&CK framework methodology, this vulnerability maps to privilege escalation techniques and credential access phases, making it particularly dangerous in environments where attackers can leverage it for further compromise. Organizations should prioritize migrating affected systems to supported software versions as a long-term solution, while maintaining detailed audit logs to track any exploitation attempts that may occur. The lack of vendor support means that organizations must rely on third-party security solutions and internal security expertise to protect against this threat.