CVE-2025-58013 is a high-severity Cross-Site Request Forgery (CSRF) vulnerability identified in the pebas CouponXxL software, affecting versions up to and including 4.5.0. CSRF vulnerabilities allow attackers to trick authenticated users into submitting unwanted requests to a web application in which they are currently authenticated. In this case, the vulnerability enables privilege escalation, meaning an attacker can potentially perform actions with higher privileges than originally granted to the victim user. The CVSS v3.1 score of 8.8 reflects the critical nature of this vulnerability, with an attack vector that is network-based (AV:N), low attack complexity (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). The scope is unchanged (S:U), but the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H). This indicates that successful exploitation could lead to full compromise of the affected system’s data and functionality. The vulnerability resides in the CouponXxL product, which is a coupon management or marketing tool developed by pebas. The lack of available patches at the time of publication increases the urgency for mitigation. Although no known exploits are currently reported in the wild, the vulnerability’s characteristics make it a significant risk, especially in environments where CouponXxL is deployed and users have elevated privileges. The CSRF nature means that attackers could craft malicious web pages or links that, when visited by authenticated users, execute unauthorized commands on their behalf, potentially leading to unauthorized coupon creation, modification, or deletion, and broader administrative control within the application.

For European organizations using CouponXxL, this vulnerability poses a substantial risk. The ability to escalate privileges via CSRF can lead to unauthorized access to sensitive marketing data, manipulation of coupon campaigns, and potential financial losses due to fraudulent coupon issuance or misuse. The high impact on confidentiality, integrity, and availability means that attackers could exfiltrate sensitive customer data, alter or delete critical marketing configurations, or disrupt coupon services, damaging business operations and reputation. Given the network attack vector and no requirement for prior authentication, attackers can target users remotely, increasing the threat surface. This is particularly concerning for e-commerce platforms, retail chains, and marketing agencies in Europe that rely on CouponXxL for customer engagement and promotions. The absence of patches means organizations must act swiftly to implement compensating controls to prevent exploitation. Additionally, regulatory compliance under GDPR mandates protection of customer data, and exploitation of this vulnerability could lead to data breaches with legal and financial consequences.

Since no official patches are currently available, European organizations should implement immediate compensating controls. These include: 1) Enforcing strict SameSite cookie attributes (e.g., SameSite=Lax or Strict) to mitigate CSRF risks by restricting cross-origin requests. 2) Implementing or enhancing anti-CSRF tokens in all state-changing requests within CouponXxL, if customization is possible. 3) Restricting access to the CouponXxL administrative interface to trusted IP ranges or via VPN to reduce exposure. 4) Educating users to avoid clicking on suspicious links or visiting untrusted websites while authenticated to CouponXxL. 5) Monitoring web server and application logs for unusual or unauthorized requests that could indicate exploitation attempts. 6) Applying web application firewalls (WAF) with rules targeting CSRF attack patterns to block malicious traffic. 7) Planning for rapid deployment of patches once released by pebas and maintaining close communication with the vendor for updates. 8) Reviewing and minimizing user privileges within CouponXxL to limit the impact of potential exploitation.