CVE-2025-55056 identifies multiple Cross-site Scripting (XSS) vulnerabilities classified under CWE-79 in the Rumpus FTP Server product, specifically version 9.0.12. These vulnerabilities arise from improper neutralization of input during web page generation, allowing malicious scripts to be injected and executed in the context of the victim's browser. The CVSS 3.1 base score is 4.8 (medium severity), with an attack vector of network (remote), low attack complexity, but requiring privileges and user interaction. The scope is changed, indicating that exploitation can affect components beyond the initially vulnerable module. The impact affects confidentiality and integrity, but not availability. Since the vulnerability requires authenticated access with privileges and user interaction, exploitation is limited to insiders or users with some level of trust. No known exploits are currently in the wild, and no patches have been published yet. The vulnerability could be leveraged to steal session tokens, manipulate displayed data, or perform actions on behalf of the victim user within the FTP server's web interface. This is particularly concerning in environments where multiple users access the FTP server's web management interface or file sharing portals. The lack of patches necessitates immediate mitigation through configuration and monitoring until an official fix is available.

For European organizations, the impact of CVE-2025-55056 centers on potential unauthorized disclosure and modification of sensitive information accessible via the Rumpus FTP Server web interface. Attackers with valid credentials could exploit XSS to hijack sessions, steal credentials, or manipulate data, undermining confidentiality and integrity. This is especially critical for organizations handling sensitive or regulated data, such as financial institutions, healthcare providers, and government agencies. The requirement for privileges and user interaction reduces the risk of widespread automated exploitation but increases the threat from insider attackers or targeted phishing campaigns. Disruption of trust in file transfer services could lead to operational delays and reputational damage. Additionally, the vulnerability could serve as a foothold for further lateral movement within networks if attackers escalate privileges post-exploitation. Given the medium severity, organizations should consider this a significant risk, particularly where Rumpus FTP Server is integrated into critical workflows or exposed to external users.

1. Restrict access to the Rumpus FTP Server web interface to trusted networks and users only, using network segmentation and firewall rules. 2. Enforce strong authentication and least privilege principles to limit user capabilities and reduce the pool of potential attackers. 3. Implement web application firewalls (WAFs) with rules to detect and block common XSS payloads targeting the FTP server interface. 4. Conduct thorough input validation and output encoding on all user-supplied data within the FTP server’s web pages, if customization or scripting is possible. 5. Monitor logs for unusual or suspicious activity indicative of attempted XSS exploitation or privilege misuse. 6. Educate users about phishing and social engineering risks that could facilitate user interaction required for exploitation. 7. Maintain up-to-date backups and incident response plans to quickly recover from any compromise. 8. Engage with the vendor for timely patch releases and apply updates as soon as they become available. 9. Consider alternative secure file transfer solutions if patching is delayed or the risk is unacceptable.