CVE-2025-63027 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the Webcreations907 WBC907 Core product up to version 3.4.1. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, allowing attackers to inject malicious scripts that are stored on the server and subsequently executed in the browsers of users who access the affected pages. This type of vulnerability can lead to a range of attacks including session hijacking, credential theft, defacement, and distribution of malware. The CVSS v3.1 base score is 6.5, indicating medium severity, with an attack vector of network (remote exploitation), low attack complexity, requiring privileges (PR:L), and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component, potentially increasing impact. Confidentiality, integrity, and availability are all rated as low impact individually, but combined they represent a meaningful risk. No known exploits are currently reported in the wild, but the vulnerability's nature makes it a candidate for targeted attacks, especially in environments where WBC907 Core is used for web content management. The lack of available patches at the time of publication necessitates immediate attention to alternative mitigations. Stored XSS vulnerabilities are particularly dangerous because the malicious payload persists on the server, affecting multiple users and increasing the attack surface. The vulnerability was reserved in October 2025 and published in December 2025, indicating recent discovery and disclosure.

For European organizations, this vulnerability poses a significant risk to web applications built on WBC907 Core, potentially leading to unauthorized access to sensitive information, session hijacking, and disruption of services. The stored nature of the XSS means that once exploited, multiple users can be affected, increasing the scale of impact. Confidentiality breaches could expose personal data protected under GDPR, leading to regulatory penalties and reputational damage. Integrity impacts could allow attackers to alter displayed content or inject malicious scripts, undermining user trust. Availability impacts, while rated low, could occur if injected scripts disrupt normal application functionality or cause denial of service. Organizations in sectors such as finance, healthcare, government, and critical infrastructure are particularly at risk due to the sensitive nature of their data and services. The requirement for some privileges and user interaction reduces the ease of exploitation but does not eliminate the threat, especially in environments with many users and complex privilege models. The medium severity rating suggests that while not critical, the vulnerability should be addressed promptly to prevent exploitation and cascading effects.

1. Apply official patches from Webcreations907 as soon as they become available to remediate the vulnerability directly. 2. Implement rigorous input validation and output encoding on all user-supplied data to neutralize malicious scripts before rendering. 3. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 4. Conduct regular security audits and code reviews focusing on input handling and web page generation logic. 5. Use web application firewalls (WAFs) configured to detect and block XSS attack patterns targeting WBC907 Core. 6. Educate users and administrators about the risks of XSS and the importance of cautious interaction with web content. 7. Monitor logs and network traffic for unusual activity that may indicate exploitation attempts. 8. Segment networks and limit privileges to reduce the impact scope if exploitation occurs. 9. Consider deploying browser security features such as HTTPOnly and Secure flags on cookies to mitigate session hijacking risks. 10. Prepare incident response plans specifically addressing XSS attack scenarios to enable rapid containment and remediation.