CVE-2025-48278 is a high-severity SQL Injection vulnerability (CWE-89) affecting the RSVPMarker product developed by davidfcarr. The vulnerability arises due to improper neutralization of special elements used in SQL commands, allowing an attacker to inject malicious SQL code. This flaw exists in versions up to 11.5.6, though the exact affected versions are not fully enumerated. The vulnerability has a CVSS v3.1 base score of 8.5, indicating a high impact. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L) reveals that the attack can be performed remotely over the network (AV:N) with low attack complexity (AC:L), requires privileges (PR:L), but no user interaction (UI:N). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality is high (C:H), while integrity is not impacted (I:N), and availability impact is low (A:L). This suggests that an attacker with some level of privileges can exploit the vulnerability remotely to extract sensitive data from the backend database without modifying data or causing significant service disruption. No known exploits are currently in the wild, and no patches have been linked yet. The vulnerability was published recently in May 2025 and has been enriched by CISA, indicating recognition by US cybersecurity authorities. RSVPMarker is a software product likely used for event RSVP management, which may be deployed in various organizational environments.

For European organizations using RSVPMarker, this vulnerability poses a significant risk to the confidentiality of sensitive data stored in backend databases, such as personal information of event attendees, internal organizational data, or other confidential records. The ability to perform SQL Injection remotely with low complexity and without user interaction increases the likelihood of exploitation, especially if attackers gain low-level privileges through other means. The changed scope impact means that the attacker could potentially access or exfiltrate data beyond the immediate application context, amplifying the breach impact. While integrity and availability impacts are low, the confidentiality breach could lead to regulatory non-compliance under GDPR, reputational damage, and potential financial penalties. Organizations in sectors handling sensitive personal or business data, such as event management companies, educational institutions, or corporate entities using RSVPMarker, are particularly at risk. The lack of available patches necessitates immediate mitigation to prevent exploitation.

1. Immediate mitigation should include restricting access to RSVPMarker to trusted internal networks and implementing strict network segmentation to limit exposure. 2. Employ Web Application Firewalls (WAFs) with custom rules to detect and block SQL Injection patterns targeting RSVPMarker endpoints. 3. Conduct thorough privilege audits and minimize user privileges to reduce the risk posed by the PR:L requirement for exploitation. 4. Monitor application logs and database query logs for anomalous or suspicious SQL queries indicative of injection attempts. 5. Engage with the vendor or community to obtain or develop patches or updates addressing the vulnerability. 6. If patching is not immediately possible, consider deploying input validation and parameterized queries at the application layer as a temporary safeguard. 7. Perform regular security assessments and penetration testing focused on injection vulnerabilities in RSVPMarker deployments. 8. Educate administrators and developers on secure coding practices to prevent similar vulnerabilities in future versions.