CVE-2025-6347 is a cross-site scripting (XSS) vulnerability identified in the code-projects Responsive Blog software, specifically affecting versions 1.0, 1.12.4, and 3.3.4. The vulnerability resides in the file /responsive/resblog/blogadmin/admin/pageViewMembers.php, where improper input validation or output encoding allows an attacker to inject malicious scripts. This flaw can be exploited remotely without requiring authentication, although the CVSS vector indicates a high privilege requirement and user interaction is necessary for successful exploitation. The vulnerability enables attackers to execute arbitrary JavaScript in the context of the victim's browser, potentially leading to session hijacking, defacement, or redirection to malicious sites. The CVSS 4.0 base score is 4.8, categorized as medium severity. No patches or fixes have been publicly disclosed yet, and no known exploits are currently observed in the wild. The vulnerability's exploitability is facilitated by the network attack vector and low attack complexity, but the need for user interaction and high privileges limits its ease of exploitation. The vulnerability does not impact confidentiality directly but poses a risk to integrity and availability through potential session manipulation or phishing attacks. The scope is limited to the Responsive Blog application and its users, particularly administrators or users accessing the affected admin page. Since the vulnerability is in a web-based blogging platform, it may affect organizations using this software for content management or internal communication portals.

For European organizations using code-projects Responsive Blog, this XSS vulnerability could lead to unauthorized script execution within the context of the affected web application. Potential impacts include theft of session cookies, enabling attackers to impersonate legitimate users, including administrators, which could lead to unauthorized changes or data exposure. Additionally, attackers could use the vulnerability to deliver phishing payloads or malware to users, undermining trust and potentially causing reputational damage. Given the administrative context of the vulnerable page, exploitation could facilitate further compromise of the blogging platform or connected systems. While the vulnerability requires high privileges and user interaction, organizations with multiple administrators or users accessing the admin interface are at increased risk. The impact is more pronounced for organizations relying on this platform for sensitive communications or internal collaboration. Disruption or compromise could affect operational continuity and data integrity. Furthermore, since the exploit is remotely initiable, attackers can target organizations without physical access, increasing the threat surface. The medium severity rating suggests moderate risk, but the lack of patches and public exploit code means organizations should proactively assess exposure and implement mitigations.

1. Immediate mitigation should include restricting access to the /responsive/resblog/blogadmin/admin/pageViewMembers.php page to trusted IP addresses or VPN users only, reducing exposure to remote attackers. 2. Implement strict Content Security Policy (CSP) headers to limit the execution of unauthorized scripts within the application context. 3. Employ web application firewalls (WAFs) with custom rules to detect and block typical XSS payload patterns targeting the vulnerable endpoint. 4. Conduct thorough input validation and output encoding on all user-supplied data in the affected page, focusing on HTML encoding to neutralize script injection vectors. 5. Monitor administrative user activity and logs for unusual behavior that may indicate exploitation attempts. 6. If possible, disable or limit the use of the affected Responsive Blog versions until a vendor patch is available. 7. Educate administrators and users about the risks of clicking on suspicious links or interacting with untrusted content, as user interaction is required for exploitation. 8. Regularly check for vendor updates or patches addressing this vulnerability and apply them promptly once released. 9. Consider migrating to alternative blogging platforms with active security support if the vendor does not provide timely fixes.