CVE-2025-47521 is a Stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the robosoft Robo Gallery product up to version 5.0.2. The vulnerability arises due to improper neutralization of input during web page generation, allowing malicious scripts to be stored and later executed in the context of users' browsers when they access affected pages. This type of vulnerability typically occurs when user-supplied input is embedded in web pages without adequate sanitization or encoding, enabling attackers to inject arbitrary JavaScript code. The CVSS 3.1 base score of 5.9 reflects a medium severity level, with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), requiring high privileges (PR:H), and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the vulnerable component. The impact metrics show low confidentiality, integrity, and availability impacts (C:L/I:L/A:L), consistent with typical XSS consequences such as session hijacking, defacement, or phishing. No known exploits are reported in the wild yet, and no patches have been linked at the time of publication. Stored XSS vulnerabilities are particularly dangerous because the malicious payload persists on the server and can affect multiple users. Robo Gallery is a web-based gallery management system, and the vulnerability could be exploited by authenticated users with elevated privileges to inject scripts that execute in other users' browsers, potentially leading to account compromise or unauthorized actions within the application. The requirement for high privileges and user interaction reduces the ease of exploitation but does not eliminate risk, especially in environments with multiple users and shared access.

For European organizations using Robo Gallery, this vulnerability poses a risk of session hijacking, unauthorized actions, and potential data exposure through malicious script execution in users' browsers. The medium severity and requirement for high privileges mean that internal threat actors or compromised privileged accounts could exploit this to escalate attacks or move laterally within the network. The impact on confidentiality, integrity, and availability, while rated low individually, can cumulatively lead to significant operational disruptions or data breaches, especially if combined with social engineering or other attack vectors. Organizations in sectors with strict data protection regulations, such as finance, healthcare, or government, may face compliance risks if user data is exposed or manipulated. The lack of known exploits in the wild currently reduces immediate risk but should not lead to complacency. The persistence of stored XSS means that once exploited, multiple users can be affected, amplifying the impact. Additionally, the cross-site scripting could be leveraged to deliver further payloads such as malware or ransomware, increasing potential damage.

To mitigate this vulnerability, European organizations should first verify if they are running affected versions of Robo Gallery (up to 5.0.2) and plan for immediate updates once patches become available. In the absence of official patches, organizations should implement strict input validation and output encoding on all user-supplied data within the application, especially in areas where content is stored and later rendered. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. Conduct thorough code reviews and penetration testing focused on input handling and script injection vectors. Limit the number of users with high privileges and enforce the principle of least privilege to reduce the risk of exploitation. Implement multi-factor authentication (MFA) to protect privileged accounts. Monitor web application logs for unusual input patterns or script injection attempts. Educate users about the risks of interacting with suspicious content and the importance of reporting anomalies. Finally, maintain an incident response plan that includes procedures for handling XSS incidents and potential data breaches.