CVE-2025-67999 identifies a Blind SQL Injection vulnerability in the Stefano Lissa Newsletter product, affecting all versions up to and including 9.0.9. The vulnerability arises from improper neutralization of special elements in SQL commands, allowing attackers to inject malicious SQL code into database queries. Blind SQL Injection means that attackers can infer database information by observing application behavior or response times, even if direct output of query results is not available. This type of injection can be exploited to extract sensitive data, modify or delete records, or escalate privileges within the database. The vulnerability does not require authentication or user interaction, increasing the risk of automated exploitation. No CVSS score has been assigned yet, and no public exploits have been reported, but the flaw is publicly disclosed and should be considered critical. The lack of available patches at the time of disclosure necessitates immediate attention to alternative mitigation strategies such as input sanitization and use of prepared statements. Organizations using this newsletter software should audit their systems for signs of exploitation and prepare to deploy fixes when released. The vulnerability affects the confidentiality and integrity of data managed by the newsletter application and could lead to significant data breaches or service interruptions if exploited.

For European organizations, the impact of CVE-2025-67999 could be substantial, especially for those relying on Stefano Lissa Newsletter for internal or external communications. Exploitation could lead to unauthorized access to subscriber data, including personal information, which would violate GDPR and other data protection regulations, potentially resulting in legal and financial penalties. The integrity of newsletter content could be compromised, damaging organizational reputation and trust. Additionally, attackers could leverage the vulnerability to pivot into broader network environments, increasing the risk of lateral movement and further compromise. Service availability might also be affected if attackers manipulate or delete critical database records. The absence of authentication requirements and user interaction lowers the barrier for attackers, increasing the likelihood of exploitation. Organizations in sectors such as media, marketing, and public communications are particularly vulnerable due to their reliance on newsletter platforms for outreach and engagement.

Given the absence of an official patch at the time of disclosure, European organizations should implement immediate compensating controls. These include: 1) Conducting thorough input validation and sanitization to reject or neutralize special characters and SQL control sequences in all user-supplied data fields related to the newsletter application. 2) Refactoring database access code to use parameterized queries or prepared statements to prevent direct concatenation of user input into SQL commands. 3) Implementing Web Application Firewalls (WAFs) with rules specifically designed to detect and block SQL injection attempts targeting the newsletter application. 4) Monitoring application logs and database query patterns for anomalies indicative of blind SQL injection attempts, such as unusual delays or error messages. 5) Restricting database user privileges to the minimum necessary to limit the impact of any successful injection. 6) Preparing for rapid deployment of official patches or updates from Stefano Lissa once available. 7) Educating development and security teams about secure coding practices to prevent similar vulnerabilities in future releases.