CVE-2026-107079 in Validation & Certification
Summary
by MITRE • 10/22/2026
An issue in Systrome Validation & Certification 1.0 allows an attacker to cause a denial of service via the t URL parameter in the qrcode_auth.html component
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Analysis
by VulDB Data Team • 10/22/2026
The vulnerability identified in Systrome Validation and Certification version 1.0 represents a significant availability risk stemming from improper input validation within the web application's authentication module. Specifically, the flaw resides in the handling of the t URL parameter passed to the qrcode_auth.html component. This component is responsible for processing QR code-based authentication requests, which are increasingly common in modern two-factor and multi-factor authentication systems due their convenience and security benefits over traditional SMS or token methods. However, when an attacker supplies a malformed or excessively long string as the value for the t parameter, the application fails to implement adequate bounds checking or exception handling mechanisms before processing this input. This lack of sanitization allows maliciously crafted data to disrupt the normal execution flow of the server-side logic associated with generating or validating QR codes.
From a technical perspective, this issue is classified under CWE-20 Improper Input Validation and often leads to CWE-400 Uncontrolled Resource Consumption if the processing loop does not terminate correctly upon receiving invalid input. The attacker can exploit this by sending repeated requests containing specific malformed payloads designed to trigger infinite loops, memory leaks, or stack overflows within the application server. Because QR code generation involves encoding data into a visual format and often requires cryptographic operations for signing tokens, inefficient handling of large or corrupted inputs can consume disproportionate amounts of CPU cycles and memory resources. This resource exhaustion prevents legitimate users from accessing the authentication service, effectively creating a denial of service condition without requiring any form of prior authentication if the endpoint is publicly accessible during certain phases of the login process.
The operational impact of this vulnerability extends beyond simple downtime for individual sessions. In enterprise environments where Systrome Validation and Certification might be integrated into broader identity management systems or compliance workflows, an outage in the QR code authentication component can halt critical business processes that rely on secure access controls. Attackers leveraging this flaw through automated scripts could sustain a persistent denial of service attack with minimal effort, as no complex exploitation chain is required beyond crafting specific HTTP requests to the targeted endpoint. This aligns with MITRE ATT&CK technique T1499 Endpoint Denial of Service, where adversaries aim to degrade or destroy the availability of target resources by exhausting system capacity through resource-intensive actions rather than compromising confidentiality or integrity directly.
To mitigate this vulnerability, developers must implement strict input validation and sanitization routines for all parameters passed to the qrcode_auth.html component, particularly focusing on length limits and character set restrictions for the t parameter. Implementing rate limiting at both the application layer and network perimeter can help detect and block automated abuse patterns associated with denial of service attacks. Additionally, integrating timeout mechanisms and resource usage monitoring within the server configuration ensures that any single request or session cannot monopolize system resources indefinitely. Upgrading to a patched version of Systrome Validation and Certification is essential if available, as vendors typically address such flaws by hardening input parsing logic and adding robust error handling procedures that gracefully manage unexpected inputs without crashing the service.