CVE-2025-62913 identifies a stored Cross-site Scripting (XSS) vulnerability in the wpopal Opal Service, a web service product used for content or service delivery. The vulnerability stems from improper neutralization of user-supplied input during web page generation, which allows malicious scripts to be stored on the server and executed in the browsers of users who access the affected pages. This type of vulnerability can lead to unauthorized actions such as session hijacking, defacement, or redirection to malicious sites. The affected versions include all releases up to and including version 1.9.1, with no specific earliest affected version identified. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) indicates that the attack can be performed remotely over the network with low attack complexity, requires low privileges, and user interaction is necessary. The scope is changed, meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact affects confidentiality and integrity but not availability. No known exploits have been reported in the wild, and no official patches have been released as of the publication date. The vulnerability was reserved and published in late October 2025 by Patchstack. Given the nature of stored XSS, the risk is significant in environments where multiple users interact with the service and where sensitive data or authentication tokens are handled via the web interface.

For European organizations, this vulnerability poses a moderate risk primarily to web applications using the wpopal Opal Service. Exploitation could lead to theft of user credentials, session tokens, or other sensitive information, potentially enabling further compromise of internal systems. The integrity of data presented to users can be undermined, leading to misinformation or unauthorized actions performed on behalf of users. While availability is not directly impacted, the reputational damage and potential regulatory consequences under GDPR for data breaches involving personal data could be significant. Organizations with customer-facing portals or internal dashboards using the affected product are at higher risk. The requirement for user interaction limits automated exploitation but does not eliminate risk, especially in phishing or social engineering scenarios. The absence of known exploits currently reduces immediate threat but does not preclude future active exploitation.

European organizations should implement strict input validation and output encoding on all user-supplied data within the Opal Service environment to prevent script injection. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Monitor web application logs for unusual input patterns or script payloads indicative of attempted exploitation. Segregate user roles and minimize privileges to reduce the impact of compromised accounts. Since no official patch is currently available, organizations should engage with the vendor for timelines and consider temporary mitigations such as web application firewalls (WAFs) with rules targeting XSS payloads. Educate users about the risks of interacting with suspicious links or content within the affected service. Once patches are released, prioritize their deployment. Conduct regular security assessments and penetration testing focused on XSS vulnerabilities in the affected systems.