CVE-2025-13239 is a security vulnerability identified in version 5 of the Bdtask Isshue Multi Store eCommerce Shopping Cart Solution. The vulnerability resides in the /submit_checkout functionality, where manipulation of the parameters order_total_amount and cart_total_amount can enforce unintended behavioral workflows during the checkout process. This manipulation likely allows an attacker to interfere with the transaction logic, potentially altering the amounts processed or bypassing intended validation steps. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing its risk profile. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L but no authentication needed), no user interaction (UI:N), and limited impact on integrity (VI:L) with no impact on confidentiality or availability. The vendor has not responded to the disclosure, and no patches have been released, leaving systems exposed. Although no known exploits are currently reported in the wild, the public disclosure and ease of exploitation suggest a credible threat. The vulnerability primarily affects the integrity of transaction data, which could lead to financial discrepancies, fraud, or disruption of eCommerce operations. The lack of vendor response and patch availability necessitates immediate defensive measures by users of this software.

For European organizations operating eCommerce platforms using the Bdtask Isshue Multi Store solution, this vulnerability poses a risk to the integrity of financial transactions. Attackers could manipulate order amounts during checkout, potentially leading to financial losses, fraudulent orders, or disruption of customer trust. This could also result in regulatory compliance issues under GDPR and eCommerce regulations if customer transactions are compromised. The remote exploitability without authentication increases the threat surface, especially for publicly accessible web storefronts. Disruption or manipulation of checkout workflows can damage brand reputation and customer confidence. Given the lack of vendor patching, organizations face prolonged exposure, increasing the likelihood of exploitation. The impact is particularly significant for medium to large European eCommerce businesses relying on this software for multi-store management and payment processing.

Since no official patch is available, European organizations should implement immediate compensating controls. These include: 1) Implement strict server-side validation and sanitization of the order_total_amount and cart_total_amount parameters to prevent manipulation. 2) Monitor and log all checkout transactions for anomalies such as unexpected order amounts or frequency spikes. 3) Restrict access to the /submit_checkout endpoint using web application firewalls (WAFs) with custom rules to detect and block suspicious parameter tampering. 4) Employ rate limiting and IP reputation filtering to reduce exposure to automated attacks. 5) Conduct regular security assessments and penetration testing focusing on the checkout workflow. 6) Consider temporary disabling or restricting multi-store checkout features if feasible until a patch is released. 7) Maintain incident response readiness to quickly address any detected exploitation attempts. 8) Engage with the vendor or community for updates and potential unofficial patches or workarounds.