CVE-2025-13246 is a path traversal vulnerability discovered in the JwtAuthenticationFilter function of the shsuishang ShopSuite ModulithShop product, specifically up to the commit 45a99398cec3b7ad7ff9383694f0b53339f2d35a. The vulnerability arises from insufficient validation of user-supplied input used in file path construction, allowing attackers to traverse directories and access files outside the intended scope. This flaw can be exploited remotely without authentication or user interaction, leveraging crafted requests to manipulate the file path parameter. The product's rolling release development model means that traditional versioning does not apply, complicating identification of affected versions and patch deployment. The CVSS 4.0 score of 5.3 reflects a medium severity, indicating moderate impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required. Although no active exploitation has been reported, a public exploit is available, increasing the risk of future attacks. The vulnerability could expose sensitive configuration files, credentials, or other critical data, potentially enabling further attacks or system compromise. The JwtAuthenticationFilter is a security-critical component responsible for JWT token validation; exploitation could undermine authentication mechanisms. The lack of patches or version updates necessitates immediate attention from users of this software to implement compensating controls and monitor for exploitation attempts.

For European organizations, the path traversal vulnerability in ShopSuite ModulithShop poses risks including unauthorized disclosure of sensitive files such as configuration files, credentials, or business data, which could lead to data breaches and compliance violations under GDPR. Integrity of the system could be compromised if attackers modify files or inject malicious content, potentially disrupting e-commerce operations and damaging customer trust. Availability impacts may arise if attackers access or delete critical files, causing service outages. Given the remote exploitability without authentication, attackers can target exposed instances over the internet, increasing the attack surface. Organizations relying on this platform for online sales or customer data management face operational and reputational risks. The rolling release nature of the product complicates patch management, increasing exposure duration. Additionally, the presence of a public exploit raises the likelihood of opportunistic attacks. European entities must consider these factors in their risk assessments and incident response planning.

1. Implement strict input validation and sanitization on all parameters used in file path construction within JwtAuthenticationFilter to prevent directory traversal sequences (e.g., '../'). 2. Employ allowlisting of permissible file paths or directories to restrict file access strictly to intended locations. 3. Use secure coding practices such as canonicalization of file paths before access to detect and block traversal attempts. 4. Monitor application logs and network traffic for unusual access patterns or attempts to access sensitive files. 5. Deploy Web Application Firewalls (WAFs) with rules targeting path traversal attack signatures to provide an additional defensive layer. 6. Engage with the vendor or community to obtain patches or updates as soon as they become available, despite the rolling release model. 7. Conduct regular security assessments and penetration testing focusing on path traversal and authentication bypass vectors. 8. Isolate the ShopSuite ModulithShop environment with network segmentation to limit exposure if compromise occurs. 9. Educate development and operations teams about secure handling of file paths and authentication filters. 10. Prepare incident response plans specifically addressing potential exploitation of this vulnerability.