CVE-2025-6108 is a path traversal vulnerability identified in the hansonwang99 Spring-Boot-In-Action project, specifically affecting the function watermarkTest within the ImageUploadService.java file. This vulnerability arises due to insufficient validation or sanitization of the 'filename' argument passed to the file upload component. An attacker can manipulate this parameter to traverse directories on the server's filesystem, potentially accessing files outside the intended upload directory. The vulnerability is exploitable remotely without requiring user interaction or authentication, increasing its risk profile. The product uses a rolling release model, which complicates pinpointing exact affected versions beyond the commit hash 807fd37643aa774b94fd004cc3adbd29ca17e9aa. The vendor has not responded to disclosure attempts, and no official patches or version updates are currently available. Although the CVSS v4.0 base score is 5.3 (medium severity), the vulnerability allows unauthorized file system access, which could lead to information disclosure or further exploitation depending on the server environment and file permissions. The exploit has been publicly disclosed but is not yet observed in the wild. The vulnerability does not require privileges or user interaction, and the attack vector is network-based, making it accessible to remote attackers. The lack of scope change indicates the impact is limited to the vulnerable component and its immediate environment.

For European organizations using the hansonwang99 Spring-Boot-In-Action framework, this vulnerability poses a risk of unauthorized access to sensitive files on servers hosting vulnerable applications. This could lead to leakage of confidential data, exposure of configuration files, or disclosure of credentials stored on the filesystem. In critical sectors such as finance, healthcare, or government, such data exposure could result in regulatory non-compliance, reputational damage, and operational disruptions. Additionally, attackers could leverage the path traversal to upload or execute malicious files if combined with other vulnerabilities or misconfigurations, potentially leading to full system compromise. The remote and unauthenticated nature of the exploit increases the attack surface, especially for publicly accessible web services. Given the rolling release model and lack of vendor response, organizations may face challenges in timely patching, increasing exposure duration. The medium CVSS score suggests moderate impact, but the actual risk could be higher depending on deployment context and data sensitivity.

1. Implement strict input validation and sanitization on all file upload parameters, especially the 'filename' argument, to prevent directory traversal sequences such as '../'. 2. Employ allowlisting of acceptable file names and extensions, rejecting any input containing suspicious path characters or patterns. 3. Configure the application to store uploaded files in isolated directories with minimal permissions, preventing access to sensitive system files even if traversal occurs. 4. Use containerization or sandboxing techniques to limit the impact of potential exploitation. 5. Monitor logs for unusual file access patterns or errors related to file uploads to detect exploitation attempts early. 6. If possible, temporarily disable or restrict the vulnerable watermarkTest functionality until a patch or update is available. 7. Engage in active threat intelligence sharing within industry groups to stay informed about emerging exploits targeting this vulnerability. 8. Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block path traversal payloads targeting the affected endpoint. 9. Conduct thorough code reviews and security testing on custom or third-party components that handle file uploads to identify similar vulnerabilities proactively.