CVE-2025-57953 is a medium-severity vulnerability classified under CWE-79, indicating an improper neutralization of input during web page generation, commonly known as Cross-site Scripting (XSS). Specifically, this vulnerability affects the 100plugins Open User Map product, versions up to and including 1.4.14. The vulnerability is DOM-based XSS, meaning that malicious scripts are executed as a result of unsafe handling of user input within the Document Object Model (DOM) environment on the client side, rather than server-side injection. The CVSS 3.1 score is 6.5, reflecting a medium severity with the vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L. This indicates that the attack can be performed remotely over the network with low attack complexity, requires low privileges but does require user interaction, and the scope is changed, meaning the vulnerability affects components beyond the initially vulnerable component. The impact includes limited confidentiality, integrity, and availability losses. Since no patches are currently linked, the vulnerability remains unpatched, increasing the risk for affected users. DOM-based XSS can allow attackers to execute arbitrary JavaScript in the context of the victim's browser, potentially leading to session hijacking, defacement, or redirection to malicious sites. The vulnerability arises from improper input sanitization or encoding when generating web pages dynamically, allowing malicious payloads to be injected and executed in the victim's browser environment.

For European organizations using 100plugins Open User Map, this vulnerability poses a risk of client-side attacks that can compromise user sessions, steal sensitive information, or manipulate user interactions. Given that Open User Map is likely used for mapping and geolocation services, exploitation could lead to misinformation, unauthorized data access, or manipulation of location data, which may affect operational decisions or user trust. The medium severity and requirement for user interaction mean that targeted phishing or social engineering campaigns could be used to exploit this vulnerability. In sectors such as government, transportation, or logistics, where geospatial data integrity is critical, the impact could be more pronounced. Additionally, the scope change in the CVSS vector suggests that exploitation could affect multiple components or users beyond the initially targeted system, increasing potential damage. Although no known exploits are currently in the wild, the absence of patches means organizations must proactively mitigate the risk to prevent future exploitation.

European organizations should immediately assess their use of 100plugins Open User Map and identify affected versions (up to 1.4.14). Since no official patches are currently available, mitigation should focus on implementing strict input validation and output encoding on all user-supplied data within the application, especially in the client-side scripts handling the DOM. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. Additionally, organizations should educate users about the risks of interacting with untrusted links or inputs that could trigger the vulnerability. Monitoring web application logs for unusual activity or script injections can help detect attempted exploitation. Where possible, consider isolating or sandboxing the Open User Map component to limit the scope of potential attacks. Finally, maintain communication with the vendor 100plugins for updates and patches, and plan for prompt application of fixes once released.