CVE-2025-58619 is a deserialization of untrusted data vulnerability found in the sbouey Falang multilanguage plugin, which is used to provide multilingual support on websites, commonly integrated with CMS platforms like Joomla or WordPress. The flaw exists in versions up to and including 1.3.65, allowing attackers to perform object injection by sending specially crafted serialized data to the application. This vulnerability arises because the plugin improperly handles deserialization of user-controllable input without adequate validation or sanitization, enabling attackers to inject malicious objects. Successful exploitation can lead to remote code execution, unauthorized data access, or denial of service, impacting confidentiality, integrity, and availability. The CVSS v3.1 base score is 8.8, indicating high severity, with attack vector network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), and full impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no known exploits are currently in the wild, the vulnerability's characteristics make it a significant risk. The vulnerability was reserved in early September 2025 and published in November 2025, with no patches currently linked, suggesting that remediation may still be pending or in progress. The vulnerability is particularly critical for organizations relying on Falang multilanguage for managing multilingual content, as exploitation could compromise entire web platforms.

For European organizations, the impact of CVE-2025-58619 can be substantial. Many European enterprises and public sector entities operate multilingual websites to serve diverse populations, often relying on plugins like Falang multilanguage. Exploitation could lead to unauthorized access to sensitive customer data, intellectual property theft, website defacement, or complete service disruption. This can damage reputation, lead to regulatory non-compliance (e.g., GDPR violations), and cause financial losses. The requirement for user interaction may limit automated mass exploitation but does not eliminate risk, especially in phishing or social engineering scenarios common in Europe. The vulnerability's network accessibility and lack of privilege requirements increase the attack surface, making it feasible for remote attackers to target vulnerable systems. Given Europe's strong regulatory environment and emphasis on data protection, the consequences of a breach exploiting this vulnerability could trigger significant legal and financial penalties.

1. Monitor official sbouey and Falang multilanguage channels for patches and apply them immediately upon release. 2. Until patches are available, restrict access to the Falang plugin interfaces to trusted users and networks using web application firewalls (WAFs) and network segmentation. 3. Implement input validation and sanitization controls to prevent untrusted serialized data from being processed. 4. Employ runtime application self-protection (RASP) or behavior-based anomaly detection to identify and block suspicious deserialization attempts. 5. Educate users about the risks of interacting with untrusted content to reduce the likelihood of user interaction-based exploitation. 6. Conduct regular security audits and penetration testing focusing on deserialization vulnerabilities. 7. Maintain comprehensive logging and monitoring to detect early signs of exploitation attempts. 8. Consider disabling or replacing the Falang multilanguage plugin with alternative multilingual solutions that do not rely on unsafe deserialization practices.