CVE-2026-116766 in Secure Access
Summary
by MITRE • 11/02/2026
CVE-2026-116766 is an improper input handling vulnerability in the Secure Access server versions between 13.0 and prior to 14.61. Attackers can cause a persistent denial of service of the server.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 11/02/2026
The identified security issue, designated as CVE-2026-116766, represents a critical flaw within the Secure Access server software ecosystem, specifically affecting versions ranging from 13.0 up to but excluding version 14.61. This vulnerability is categorized fundamentally as an improper input handling defect, which indicates that the application fails to adequately validate, sanitize, or constrain user-supplied data before processing it. In enterprise environments where Secure Access servers serve as gateways for remote workforce connectivity and sensitive resource access, such a flaw poses significant operational risks due to the high visibility and critical nature of these systems. The core technical deficiency lies in the server's inability to properly manage specific input sequences or malformed requests that trigger internal logic errors rather than returning appropriate error codes or rejecting the request gracefully.
From a technical perspective, this vulnerability allows an unauthenticated attacker to exploit the improper input handling mechanism by sending specially crafted network packets or HTTP requests designed to exhaust system resources or cause the application process to crash repeatedly. Unlike transient service interruptions caused by legitimate traffic spikes, attacks exploiting CVE-2026-116766 result in a persistent denial of service state. This means that once triggered, the server may enter an unstable loop or fail to recover without manual intervention such as a restart, effectively rendering the authentication and access control services unavailable for extended periods. The persistence aspect is particularly dangerous because it can lead to cascading failures across dependent systems that rely on continuous availability from this Secure Access infrastructure.
The operational impact of this vulnerability extends beyond simple service unavailability. In a typical deployment, the Secure Access server acts as the primary entry point for remote users accessing internal corporate resources via virtual private networks or web-based applications. A persistent denial of service effectively severs these connections, halting business operations and preventing authorized personnel from performing their duties. Furthermore, during such outages, organizations may be forced to activate emergency response procedures that are costly in terms of time and labor. The vulnerability also presents a secondary risk profile where the instability caused by repeated crashes could potentially mask other malicious activities or lead to data corruption if transactions were interrupted mid-processing, although the primary documented impact remains service disruption.
In alignment with industry-standard classification frameworks, this flaw maps directly to CWE-20 Improper Input Validation within the Common Weakness Enumeration taxonomy. The failure to enforce strict constraints on input length, format, or content allows attackers to trigger undefined behavior in the server's processing engine. From a tactical standpoint, as defined by the MITRE ATT&CK framework, this vulnerability facilitates Denial of Service (T1499) attacks through endpoint or resource exhaustion techniques. Attackers can leverage automated tools to continuously send malformed inputs, ensuring that the service remains unavailable and preventing recovery until administrative action is taken. This aligns with broader threat actor objectives of disrupting organizational continuity rather than stealing data directly.
Mitigation strategies for CVE-2026-116766 must prioritize immediate remediation through software updates. Administrators should upgrade all affected Secure Access servers to version 14.61 or later, where the vendor has implemented fixes for the input validation logic. Until patching is feasible, organizations can implement network-level mitigations such as rate limiting and strict firewall rules that restrict access to the management interfaces of these servers from untrusted networks. Additionally, deploying Web Application Firewalls with specific rule sets designed to detect anomalous request patterns or oversized payloads can help filter out malicious inputs before they reach the vulnerable application layer. Regular monitoring for unusual spikes in error logs related to input processing should also be established to detect exploitation attempts early and minimize downtime duration during incident response activities.