The vulnerability identified as CVE-2026-2690 affects the itsourcecode Event Management System version 1.0. It is a SQL injection flaw located in the admin login functionality, specifically in the /admin/ajax.php endpoint with the action parameter set to login. The vulnerability arises from improper sanitization of the Username argument, allowing an attacker to inject malicious SQL code remotely without requiring authentication or user interaction. This can lead to unauthorized access to the backend database, enabling attackers to read, modify, or delete sensitive data, or potentially escalate privileges within the system. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and partial impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). Although no official patches or fixes have been published, the exploit code is publicly available, increasing the risk of exploitation. The vulnerability affects only version 1.0 of the product, which may limit the scope but still poses a significant risk to organizations relying on this software for event management. The lack of known exploits in the wild suggests limited active exploitation currently, but the availability of exploit code means this could change rapidly.

For European organizations, exploitation of this vulnerability could result in unauthorized access to sensitive event management data, including personal information of attendees, event schedules, and administrative credentials. This could lead to data breaches, loss of data integrity, and disruption of event operations. The compromise of administrative login could allow attackers to manipulate event configurations or gain persistent access to the system. Given the critical role of event management systems in organizing conferences, public gatherings, and corporate events, such disruptions could have reputational and operational consequences. Additionally, exposure of personal data could trigger regulatory penalties under GDPR. Organizations using version 1.0 of this software are particularly at risk, especially if they have not implemented compensating controls or network segmentation. The medium severity rating reflects the balance between ease of exploitation and partial impact on system security.

Immediate mitigation steps include implementing strict input validation and sanitization on the Username parameter to prevent SQL injection. Developers should refactor the login code to use parameterized queries or prepared statements to eliminate injection vectors. Until an official patch is released, organizations should restrict access to the /admin/ajax.php endpoint via network controls such as IP whitelisting or VPN access. Monitoring and logging of login attempts should be enhanced to detect anomalous or repeated injection patterns. Conducting a thorough audit of existing event management systems to identify vulnerable versions is critical. If possible, upgrade to a newer, patched version of the software or consider alternative event management solutions. Employ web application firewalls (WAFs) configured to detect and block SQL injection attempts targeting this endpoint. Regular backups and incident response plans should be updated to prepare for potential exploitation scenarios. Finally, coordinate with the vendor for timely patch releases and vulnerability disclosures.