CVE-2025-58245 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 bestweblayout Portfolio product, versions up to 2.58. The vulnerability is DOM-based XSS, meaning that malicious scripts are executed as a result of unsafe manipulation of the Document Object Model (DOM) in the client browser, rather than server-side injection. This type of XSS occurs when client-side scripts write user-controllable data to the DOM without proper sanitization or encoding, allowing attackers to execute arbitrary JavaScript in the context of the victim's browser. The CVSS 3.1 score is 5.9, reflecting a medium severity level. The vector indicates that the attack can be performed remotely over the network (AV:N) with low attack complexity (AC:L), but requires high privileges (PR:H) and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact includes low confidentiality, integrity, and availability impacts, but the combination of these factors can still lead to session hijacking, defacement, or redirection to malicious sites. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was reserved in late August 2025 and published in September 2025, indicating recent discovery and disclosure. The affected product, bestweblayout Portfolio, is a web-based portfolio management or presentation tool, which likely involves user-generated content or dynamic web pages, making it susceptible to DOM-based XSS if input is not properly sanitized client-side.

For European organizations using bestweblayout Portfolio, this vulnerability poses a risk of client-side script injection that can lead to session hijacking, theft of sensitive information, or unauthorized actions performed on behalf of authenticated users. Since the attack requires high privileges and user interaction, the threat is more relevant in environments where users have elevated access and may be tricked into interacting with malicious content. The scope change indicates that the vulnerability could affect other components or domains related to the application, potentially broadening the attack surface. Organizations in sectors such as finance, government, education, and creative industries that rely on Portfolio for managing or displaying sensitive or proprietary information could face reputational damage, data leakage, or compliance violations under GDPR if user data is compromised. The lack of known exploits reduces immediate risk, but the presence of the vulnerability in a widely used product could attract attackers once exploit code becomes available. Additionally, the medium CVSS score suggests that while the vulnerability is not critical, it should not be ignored, especially in high-value environments.

1. Immediate mitigation should include implementing strict Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of DOM-based XSS. 2. Review and sanitize all client-side inputs and outputs in the Portfolio application, ensuring that any user-controllable data inserted into the DOM is properly encoded or escaped. 3. Employ secure coding practices such as using safe JavaScript APIs that do not interpret HTML or JavaScript code from untrusted sources. 4. Conduct thorough security testing including automated and manual DOM-based XSS detection tools on the Portfolio application. 5. Monitor user activity and logs for unusual behavior that could indicate exploitation attempts. 6. Educate users about phishing and social engineering risks to reduce the likelihood of successful user interaction required for exploitation. 7. Coordinate with bestweblayout for timely patch releases and apply updates as soon as they become available. 8. Consider deploying web application firewalls (WAF) with rules tailored to detect and block XSS payloads targeting Portfolio. 9. Limit user privileges where possible to reduce the impact of compromised accounts. 10. For organizations with multiple web assets, isolate Portfolio instances to minimize scope expansion in case of compromise.