CVE-2025-62137 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the Shuttlethemes Shuttle product up to version 1.5.0. The vulnerability stems from improper neutralization of input during web page generation, which allows an attacker to inject malicious scripts that are stored and later executed in the context of users visiting the affected web pages. The vulnerability requires the attacker to have low privileges (PR:L) and user interaction (UI:R) to trigger the exploit. The CVSS 3.1 score of 6.5 indicates a medium severity with network attack vector (AV:N), low attack complexity (AC:L), and a scope change (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact includes partial loss of confidentiality, integrity, and availability, as malicious scripts can steal session cookies, manipulate page content, or perform actions on behalf of users. No known public exploits or patches are currently available, increasing the importance of proactive mitigation. The vulnerability affects web applications using Shuttle themes, which are commonly deployed on WordPress platforms, often used for corporate and public websites. The stored nature of the XSS means injected scripts persist and affect multiple users, increasing the risk of widespread impact. The vulnerability was reserved in October 2025 and published at the end of 2025, indicating it is a recent discovery.

For European organizations, this vulnerability poses a risk primarily to those using the Shuttle theme in their web infrastructure, particularly public-facing websites where attackers can inject malicious scripts that affect visitors and users. The stored XSS can lead to session hijacking, unauthorized actions performed on behalf of users, defacement, or distribution of malware. This can damage organizational reputation, lead to data breaches, and cause service disruptions. The medium severity score reflects that while exploitation requires some privileges and user interaction, the scope change means the impact can extend beyond the initial vulnerable component, potentially affecting multiple users and systems. Organizations in sectors with high web presence such as e-commerce, media, and government services are particularly vulnerable. The lack of available patches means organizations must rely on interim controls to mitigate risk. Additionally, compliance with EU data protection regulations (e.g., GDPR) may be impacted if personal data is compromised through exploitation of this vulnerability.

1. Immediately audit all web applications using the Shuttle theme to identify affected versions (up to 1.5.0). 2. Implement strict input validation and sanitization on all user-supplied data, especially in areas where content is stored and displayed. 3. Apply context-appropriate output encoding (e.g., HTML entity encoding) to neutralize potentially malicious scripts before rendering in browsers. 4. Restrict privileges to the minimum necessary to reduce the risk of attackers injecting malicious content. 5. Monitor web application logs for unusual input patterns or attempts to inject scripts. 6. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. 7. Stay alert for official patches or updates from Shuttlethemes and apply them promptly once available. 8. Educate users and administrators about the risks of XSS and encourage cautious interaction with web content. 9. Consider temporary removal or replacement of the Shuttle theme if immediate patching is not possible. 10. Conduct regular security assessments and penetration testing focused on XSS vulnerabilities.