CVE-2025-48301 is a high-severity SQL Injection vulnerability (CWE-89) found in the YayCommerce SMTP for SendGrid plugin, known as YaySMTP. This vulnerability affects versions up to 1.5 and stems from improper neutralization of special elements used in SQL commands. Specifically, the plugin fails to adequately sanitize or parameterize user-supplied input before incorporating it into SQL queries, allowing an attacker with high privileges to inject malicious SQL code. The CVSS 3.1 score of 7.6 reflects a network attack vector (AV:N) with low attack complexity (AC:L), but requiring high privileges (PR:H) and no user interaction (UI:N). The scope is changed (S:C), indicating that exploitation can affect resources beyond the vulnerable component. The impact primarily compromises confidentiality (C:H) with limited impact on availability (A:L) and no impact on integrity (I:N). Although no known exploits are currently reported in the wild, the vulnerability poses a significant risk due to its potential to leak sensitive data from the backend database. YaySMTP integrates with SendGrid SMTP services, commonly used for email delivery in e-commerce platforms built on YayCommerce. The vulnerability could allow attackers to extract sensitive customer data or internal configuration details, potentially leading to further attacks or data breaches. The lack of available patches at the time of publication necessitates immediate attention from affected organizations to mitigate risk.

For European organizations using YayCommerce with the YaySMTP plugin, this vulnerability presents a critical risk to the confidentiality of customer and transactional data. E-commerce platforms often handle personal data protected under GDPR, so exploitation could lead to significant regulatory and reputational consequences. Attackers exploiting this SQL Injection could extract sensitive information such as customer identities, payment details, or internal business logic. The high privileges required to exploit the vulnerability suggest that attackers may need to compromise an account with elevated permissions first, but once achieved, the scope of data exposure is broad due to the scope change indicated in the CVSS vector. This could facilitate lateral movement within the network or enable further attacks on backend systems. The limited impact on availability means service disruption is less likely, but data breaches remain a serious concern. The absence of known exploits in the wild currently reduces immediate risk, but the vulnerability's nature and high severity score warrant proactive mitigation to prevent future exploitation.

1. Immediate review and restriction of user privileges within YaySMTP and associated systems to minimize the number of accounts with high-level access. 2. Implement strict input validation and parameterized queries in the YaySMTP plugin codebase to prevent SQL Injection; if source code modification is not feasible, consider disabling or replacing the plugin until a patch is available. 3. Monitor database logs and application logs for unusual query patterns or access attempts indicative of SQL Injection exploitation. 4. Employ Web Application Firewalls (WAFs) with SQL Injection detection rules tailored to the YaySMTP plugin's query patterns to provide a temporary protective barrier. 5. Conduct thorough security audits and penetration testing focused on the YayCommerce environment to identify any other injection points or privilege escalation paths. 6. Stay updated with vendor advisories for patches or official mitigations and apply them promptly once released. 7. Encrypt sensitive data at rest and in transit to reduce the impact of potential data leakage. 8. Implement network segmentation to isolate critical backend databases from the web-facing components to limit the scope of an attack.