CVE-2025-15241 is an open redirect vulnerability identified in CloudPanel Community Edition up to version 2.5.1. The vulnerability exists in an unspecified function within the /admin/users endpoint, part of the HTTP Header Handler component. It stems from improper validation or sanitization of the Referer argument, which attackers can manipulate to redirect users to arbitrary external URLs. This type of vulnerability is typically exploited by crafting malicious URLs that appear legitimate but redirect victims to phishing sites or malware-hosting domains. The attack can be launched remotely without requiring authentication, although it necessitates user interaction to follow the malicious link. The vulnerability does not impact confidentiality or availability directly but compromises user trust and can facilitate social engineering attacks. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), user interaction required (UI:P), and low impact on integrity (VI:L), with no impact on confidentiality or availability. The vulnerability was publicly disclosed on December 30, 2025, and no known exploits in the wild have been reported yet. The recommended mitigation is upgrading to CloudPanel Community Edition version 2.5.2, which addresses the issue by properly validating the Referer argument to prevent open redirects.

For European organizations, the primary impact of this vulnerability lies in the potential for phishing and social engineering attacks. Attackers can exploit the open redirect to craft URLs that appear to originate from trusted CloudPanel administrative interfaces, thereby increasing the likelihood that users will click on malicious links. This can lead to credential theft, unauthorized access, or malware infections. Organizations relying on CloudPanel Community Edition for server or hosting management may see increased risk to their administrative users and indirectly to their infrastructure. While the vulnerability does not directly compromise system confidentiality or availability, the resulting phishing attacks can lead to broader security incidents. The medium severity rating reflects the moderate risk, given the ease of exploitation and the requirement for user interaction. The impact is heightened in sectors with high reliance on web-based management tools, such as hosting providers, managed service providers, and enterprises with in-house server management.

To mitigate this vulnerability, affected organizations should immediately upgrade CloudPanel Community Edition to version 2.5.2 or later, where the open redirect issue has been fixed. Additionally, organizations should implement strict URL validation and sanitization on all user-controllable inputs, especially those related to HTTP headers like Referer. Web application firewalls (WAFs) can be configured to detect and block suspicious redirect patterns. Security awareness training should be provided to administrative users to recognize phishing attempts and avoid clicking on suspicious links, particularly those purporting to come from internal management interfaces. Monitoring web server logs for unusual redirect activity can help detect exploitation attempts. Finally, organizations should consider implementing multi-factor authentication (MFA) on administrative portals to reduce the risk of credential compromise resulting from phishing.