CVE-2026-50304
Summary
by MITRE • 07/14/2026
Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker to deny service over a network.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical stack-based buffer overflow within Active Directory Federation Services that fundamentally compromises the availability and integrity of federated authentication systems. The flaw originates from insufficient input validation mechanisms within the authentication processing pipeline, where malformed or excessively long data inputs can overwrite adjacent memory locations on the stack. Such buffer overflows occur when the system fails to properly bounds-check user-supplied data before copying it into fixed-size stack buffers, creating exploitable conditions that allow attackers to manipulate program execution flow through stack corruption.
The technical exploitation of this vulnerability leverages standard buffer overflow techniques where an attacker crafts malicious authentication requests containing oversized payloads designed to overwrite return addresses and control registers within the stack frame. This allows for arbitrary code execution or process termination, directly enabling denial-of-service attacks against the targeted federation services. The impact extends beyond simple availability disruption as successful exploitation can potentially lead to privilege escalation or lateral movement within the compromised network environment, particularly when the affected services operate with elevated privileges.
From a cybersecurity perspective, this vulnerability aligns with CWE-121 stack-based buffer overflow classification and represents a significant concern for organizations relying on active directory federation services for identity management. The attack surface is particularly broad given that federation services typically handle authentication requests from multiple trusted partners and external entities, making them attractive targets for both automated exploitation attempts and targeted attacks. The vulnerability's network-based nature means that exploitation can occur remotely without requiring physical access to the target infrastructure.
Organizations must implement immediate mitigations including applying vendor security patches, implementing network segmentation to isolate federation services, and deploying intrusion detection systems capable of identifying malformed authentication requests. Additional protective measures involve configuring application-level input validation controls, enabling stack protection mechanisms such as stack canaries, and implementing strict access controls for federation service endpoints. The remediation approach should follow established cybersecurity frameworks including nist risk management framework and iso 27001 standards for vulnerability management and incident response protocols. Organizations should also consider implementing monitoring solutions that can detect anomalous authentication patterns indicative of exploitation attempts against this class of vulnerability.