CVE-2025-47479 is a security vulnerability identified in the WP Compress plugin developed by AresIT, which is used for image optimization in WordPress environments. The vulnerability is classified under CWE-1390, indicating a weakness in authentication mechanisms. Specifically, this weakness allows for authentication abuse, meaning that an attacker can bypass or circumvent the authentication controls implemented by the plugin. The CVSS 3.1 base score of 5.3 (medium severity) reflects that the vulnerability can be exploited remotely (AV:N), requires no privileges (PR:N), and no user interaction (UI:N), but it only impacts the integrity of the system (I:L) without affecting confidentiality or availability. The scope remains unchanged (S:U), meaning the vulnerability affects only the vulnerable component and does not propagate to other components. The affected versions include all releases up to and including version 6.30.30, with no specific lower bound version provided. The lack of available patches at the time of publication suggests that users of WP Compress must be cautious until a fix is released. The vulnerability could allow attackers to perform unauthorized actions within the plugin, potentially modifying or injecting malicious content or configurations, which could degrade the integrity of the website or its data. Since WP Compress is a plugin for WordPress, the vulnerability's exploitation could be leveraged to compromise the website's functionality or be a stepping stone for further attacks on the hosting environment.

For European organizations, the impact of this vulnerability depends largely on their reliance on WordPress websites utilizing the WP Compress plugin. Given the widespread use of WordPress across Europe for corporate, governmental, and e-commerce websites, exploitation of this vulnerability could lead to unauthorized modifications of website content or configurations, undermining data integrity and potentially damaging brand reputation. Although confidentiality and availability are not directly impacted, integrity loss can facilitate misinformation, defacement, or insertion of malicious code that could lead to further compromise, such as malware distribution or phishing. Organizations in sectors with high regulatory scrutiny, such as finance, healthcare, and public administration, may face compliance risks if website integrity is compromised. Additionally, attackers exploiting this vulnerability remotely without authentication or user interaction increases the risk profile, as automated attacks could be launched at scale. The absence of known exploits in the wild currently reduces immediate risk, but the medium severity and ease of exploitation warrant proactive mitigation.

1. Immediate assessment of all WordPress instances to identify the presence and version of the WP Compress plugin. 2. Until an official patch is released, consider disabling or uninstalling the WP Compress plugin to eliminate the attack surface. 3. Implement web application firewalls (WAF) with custom rules to detect and block suspicious requests targeting WP Compress endpoints. 4. Monitor web server and application logs for unusual activity related to WP Compress, such as unauthorized access attempts or anomalous API calls. 5. Restrict access to the WordPress admin interface and plugin management areas using IP whitelisting or VPN access to reduce exposure. 6. Employ security plugins that provide enhanced authentication controls and anomaly detection for WordPress. 7. Once a patch is available, prioritize prompt testing and deployment in all affected environments. 8. Educate site administrators about the vulnerability and encourage regular updates and security hygiene practices. 9. Conduct periodic security audits and penetration tests focusing on WordPress plugins and authentication mechanisms.