CVE-2026-86159 in Online Voting System
Summary
by MITRE • 09/06/2026
A flaw has been found in SourceCodester Online Voting System 1.0. Impacted is an unknown function of the file /ajax.php?action=save_user. This manipulation of the argument ID causes sql injection. The attack may be initiated remotely. The exploit has been published and may be used.
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Analysis
by VulDB Data Team • 09/06/2026
The SourceCodester Online Voting System version 1.0 contains a critical security vulnerability within its administrative or user management module, specifically located in the ajax.php file when processing requests with the action parameter set to save_user. This flaw manifests as an SQL injection weakness triggered by improper validation and sanitization of the ID argument passed via HTTP parameters. The system fails to adequately filter special characters associated with SQL syntax before incorporating them into database queries, allowing an attacker to manipulate the intended query structure. Because this endpoint is accessible remotely over a network connection, typically through standard web protocols such as HTTPS or HTTP, the vulnerability presents a significant risk vector for external adversaries seeking unauthorized access to backend data stores without requiring prior authentication credentials in some configurations, or by leveraging existing low-privilege accounts if authentication is enforced but bypassable.
The technical nature of this flaw aligns with Common Weakness Enumeration identifier CWE-89, which describes Improper Neutralization of Special Elements used in an SQL Command. In practical terms, the attacker can inject malicious SQL statements that alter the logic of database operations. This could lead to unauthorized data retrieval, such as extracting usernames and hashed passwords from user tables, modifying voting records or system configurations, or even executing administrative commands depending on the privileges assigned to the database account used by the web application. The presence of a published exploit indicates that proof-of-concept code exists which demonstrates how to leverage this specific parameter injection to achieve these outcomes, lowering the barrier for entry significantly and increasing the likelihood of automated attacks targeting systems running this unpatched version.
From an operational perspective, successful exploitation can result in severe confidentiality breaches, integrity violations, and potential availability issues if destructive commands are executed against the database engine. The impact extends beyond simple data theft; it compromises the trustworthiness of the voting system itself, potentially allowing attackers to alter election results or disrupt service delivery. This aligns with several tactics within the MITRE ATT&CK framework, particularly those related to Collection via SQL Injection and Defense Evasion through query manipulation. Organizations relying on this software for critical processes face substantial reputational and legal risks due to non-compliance with data protection regulations stemming from such breaches.
Mitigation strategies must prioritize immediate remediation of the codebase by implementing strict input validation and parameterized queries or prepared statements within the PHP application logic handling the save_user action. Developers should ensure that all user-supplied inputs, especially those interacting directly with database backends, are treated as untrusted data until explicitly validated against expected formats such as integer types for ID fields. Additionally, deploying a Web Application Firewall can provide an interim layer of defense by filtering malicious SQL patterns in incoming traffic. It is also advisable to review the principle of least privilege applied to the database user account used by the application, ensuring that it does not possess excessive permissions like file system access or administrative rights which could be abused if injection occurs. Updating to a patched version provided by SourceCodester or migrating to a more robust and maintained voting platform remains the most effective long-term solution.