CVE-2025-57919 is a high-severity vulnerability classified under CWE-502: Deserialization of Untrusted Data, affecting the ConveyThis Language Translate Widget for WordPress. This vulnerability allows an attacker to perform object injection attacks by exploiting unsafe deserialization processes within the plugin. Specifically, versions up to 264 of the ConveyThis widget are vulnerable. Deserialization vulnerabilities occur when untrusted input is deserialized without proper validation or sanitization, enabling attackers to manipulate serialized objects to execute arbitrary code, escalate privileges, or cause denial of service. In this case, the vulnerability requires network access (AV:N), low attack complexity (AC:L), but requires high privileges (PR:H) and no user interaction (UI:N). The scope is unchanged (S:U), but the impact is high on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no public exploits are currently known, the potential for severe impact is significant given the nature of object injection attacks. The vulnerability affects WordPress sites using the ConveyThis Language Translate Widget, which is commonly used to provide multilingual support on websites. The lack of available patches at the time of publication increases the urgency for mitigation.

For European organizations, this vulnerability poses a substantial risk, especially for businesses relying on WordPress for their web presence and utilizing the ConveyThis widget for multilingual support. Exploitation could lead to unauthorized access to sensitive data, website defacement, or complete service disruption, impacting customer trust and regulatory compliance, particularly under GDPR. The high impact on confidentiality, integrity, and availability means that attackers could exfiltrate personal data, modify website content, or render services unavailable. This is particularly critical for sectors such as e-commerce, government portals, and financial services, which often use multilingual plugins to serve diverse user bases. Additionally, compromised websites could be used as launchpads for further attacks within the network or for distributing malware. The requirement for high privileges to exploit the vulnerability suggests that attackers may need to compromise an account with elevated rights first, but once achieved, the damage potential is severe.

European organizations should immediately audit their WordPress installations to identify the use of the ConveyThis Language Translate Widget and verify the version in use. Until an official patch is released, organizations should consider disabling or removing the plugin to eliminate the attack surface. Implement strict access controls to limit administrative privileges on WordPress sites, reducing the risk of privilege escalation. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious serialized payloads targeting the plugin. Monitor logs for unusual activity related to the plugin, such as unexpected POST requests or deserialization attempts. Additionally, organizations should maintain regular backups of their websites to enable rapid recovery in case of compromise. Once a patch becomes available, prioritize its deployment. Finally, educate site administrators about the risks of deserialization vulnerabilities and the importance of plugin hygiene, including timely updates and vetting third-party components.