CVE-2025-64356 is a vulnerability identified in the f1logic Insert PHP Code Snippet plugin, specifically in versions up to and including 1.4.3. The core issue is a missing authorization control that allows users with limited privileges (low privileges) to insert PHP code snippets into the system without proper permission checks. This vulnerability stems from incorrectly configured access control security levels, meaning that the plugin does not adequately verify whether a user is authorized to perform the code insertion action. The vulnerability is remotely exploitable over the network (AV:N) with low attack complexity (AC:L), requiring only low privileges (PR:L) and no user interaction (UI:N). The impact is limited to confidentiality (C:L), with no direct impact on integrity or availability. While the insertion of PHP code snippets could theoretically lead to further exploitation or information disclosure, the immediate impact is considered medium severity with a CVSS score of 4.3. No known exploits are currently reported in the wild, and no patches have been released at the time of publication. The vulnerability affects web environments where the Insert PHP Code Snippet plugin is installed, commonly used in WordPress or similar PHP-based content management systems to allow administrators or users to embed PHP code within posts or pages. The missing authorization check could allow an attacker with low-level access to escalate their capabilities by injecting arbitrary PHP code, potentially leading to information leakage or a foothold for further attacks if combined with other vulnerabilities or misconfigurations.

For European organizations, this vulnerability poses a moderate risk primarily in web hosting environments using the f1logic Insert PHP Code Snippet plugin. The unauthorized insertion of PHP code snippets can lead to information disclosure, which may expose sensitive data or internal system details. While the vulnerability does not directly impact system integrity or availability, the ability to insert PHP code could be leveraged in chained attacks to escalate privileges or execute malicious payloads. Organizations relying on PHP-based CMS platforms, especially WordPress, are at higher risk if they use this plugin and have not restricted access properly. The exposure is particularly relevant for companies handling sensitive customer data, intellectual property, or critical infrastructure information. Additionally, regulatory frameworks such as GDPR impose strict requirements on data protection, and any data leakage could result in compliance violations and financial penalties. The lack of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once the vulnerability details become widely known.

European organizations should immediately audit their use of the f1logic Insert PHP Code Snippet plugin and verify the versions deployed, ensuring they are not running version 1.4.3 or earlier. Until an official patch is released, organizations should restrict access to the plugin functionality strictly to trusted administrators with verified credentials, minimizing the number of users with privileges to insert PHP code snippets. Implementing web application firewalls (WAFs) with rules to detect and block unauthorized PHP code insertions can provide an additional layer of defense. Regularly monitor logs and file integrity to detect any unauthorized changes or suspicious PHP code insertions. Organizations should also review and tighten access control policies on their CMS platforms, ensuring the principle of least privilege is enforced. Once a patch or update is available from the vendor, it should be applied promptly. Additionally, consider isolating or sandboxing environments where PHP code snippets are executed to limit potential damage from unauthorized code execution. Security awareness training for administrators on the risks of unauthorized code insertion is also recommended.