CVE-2026-34455 identifies a critical SQL injection vulnerability in Hi.Events, an open-source event management and ticket selling platform. The vulnerability exists in versions from 0.8.0-beta.1 to before 1.7.1-beta, where multiple repository classes directly pass the user-controlled 'sort_by' query parameter to the Eloquent ORM's orderBy() function without any sanitization or validation. Since the application uses PostgreSQL, which supports stacked queries, an attacker can inject arbitrary SQL commands through this parameter. This improper neutralization of special elements in SQL commands (CWE-89) allows unauthenticated remote attackers to execute arbitrary SQL queries, potentially leading to unauthorized data disclosure, data manipulation, or complete compromise of the backend database. The vulnerability requires no authentication or user interaction, making it highly exploitable over the network. The issue was addressed and patched in version 1.7.1-beta by implementing proper input validation and sanitization on the 'sort_by' parameter to prevent injection. No known exploits have been reported in the wild yet, but the high CVSS score (8.7) reflects the critical nature of this flaw. Organizations using affected versions should prioritize upgrading to the patched release and review their input handling practices to prevent similar injection flaws.

The impact of CVE-2026-34455 is significant for organizations using affected versions of Hi.Events. Successful exploitation can lead to unauthorized disclosure of sensitive event and user data, modification or deletion of database records, and potentially full compromise of the backend PostgreSQL database. This can result in data breaches, loss of customer trust, financial losses, and regulatory penalties. Since the vulnerability requires no authentication or user interaction, attackers can remotely exploit it with ease, increasing the risk of widespread attacks. The ability to execute stacked queries further amplifies the potential damage by enabling complex multi-step attacks within a single injection. Organizations relying on Hi.Events for event management and ticket sales may face operational disruptions and reputational damage if exploited. The vulnerability also poses risks to any integrated systems that rely on the compromised database, potentially cascading the impact across broader IT environments.

To mitigate CVE-2026-34455, organizations should immediately upgrade Hi.Events to version 1.7.1-beta or later, where the vulnerability has been patched. In addition to upgrading, it is critical to implement strict input validation and sanitization on all user-supplied parameters, especially those used in SQL query construction such as 'sort_by'. Employ parameterized queries or ORM features that safely handle dynamic ordering to prevent injection. Conduct thorough code reviews focusing on input handling and database query construction to identify and remediate similar vulnerabilities. Deploy Web Application Firewalls (WAFs) with rules designed to detect and block SQL injection attempts targeting the 'sort_by' parameter. Monitor database logs and application logs for suspicious query patterns indicative of injection attempts. Finally, maintain an incident response plan to quickly address any exploitation attempts and regularly update dependencies to incorporate security patches.