CVE-2025-62749 is a DOM-based Cross-site Scripting (XSS) vulnerability identified in the Bainternet User Specific Content product, affecting versions up to 1.0.6. The root cause is improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious scripts that execute in the context of the victim's browser. This type of vulnerability is classified under CWE-79. The vulnerability is exploitable remotely over the network (AV:N), requires low attack complexity (AC:L), but does require privileges (PR:L) and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact affects confidentiality, integrity, and availability, but only to a limited extent (C:L, I:L, A:L). No patches are currently listed, and no known exploits have been reported in the wild. The vulnerability was reserved in October 2025 and published at the end of 2025. Bainternet’s User Specific Content is a web-based product that likely serves personalized content to users, making it a target for DOM-based XSS attacks that can steal session tokens, manipulate content, or perform actions on behalf of users. The vulnerability’s medium severity score reflects the balance between ease of exploitation and the limited but non-negligible impact on affected systems.

For European organizations using Bainternet User Specific Content, this vulnerability poses risks of session hijacking, data theft, and unauthorized actions performed in the context of authenticated users. The DOM-based XSS can lead to compromise of user accounts, leakage of sensitive information, and potential disruption of services. Organizations in sectors such as finance, healthcare, and government, where personalized web content is common and data sensitivity is high, are particularly at risk. The vulnerability could also be leveraged as a foothold for more advanced attacks or lateral movement within networks. Given the requirement for user interaction, phishing or social engineering campaigns could be used to trigger exploitation. The medium severity indicates that while the threat is serious, it is not critical, but still demands timely remediation to prevent exploitation.

1. Monitor Bainternet’s official channels for patches or updates addressing CVE-2025-62749 and apply them promptly once available. 2. Implement strict input validation and sanitization on all user-supplied data, especially in areas generating dynamic web content. 3. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 4. Conduct regular security testing, including automated and manual penetration testing focused on DOM-based XSS vectors. 5. Educate users about phishing and social engineering risks to reduce the likelihood of successful exploitation requiring user interaction. 6. Employ web application firewalls (WAFs) with rules tuned to detect and block XSS payloads targeting the affected product. 7. Review and harden authentication and session management mechanisms to limit the damage of potential session hijacking. 8. Log and monitor web application activity for unusual behavior indicative of exploitation attempts.