CVE-2025-4654 is a vulnerability identified in the Soumettre.fr WordPress plugin, affecting all versions up to and including 2.1.5. The root cause is improper authorization checks in the make_signature function, which allows unauthenticated attackers to bypass access controls. Specifically, when the Soumettre account is not connected (i.e., no API key is installed), attackers can create, edit, or delete Soumettre posts without any authentication. This vulnerability is categorized under CWE-285, indicating improper authorization. The CVSS 3.1 base score is 3.7, reflecting a low severity primarily due to the high attack complexity and the requirement that the API key is not installed, which is a specific configuration state. The vulnerability does not impact confidentiality or availability but allows limited integrity modifications to Soumettre posts. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability affects only installations where the API key is missing, which is a misconfiguration or incomplete setup scenario rather than a default state. This means that properly configured Soumettre.fr plugins are not vulnerable. The attack vector is network-based with no privileges or user interaction required, but the attack complexity is high because the attacker must find an installation without the API key connected. The scope remains unchanged as the vulnerability affects only the Soumettre plugin's data and not other system components.

For European organizations using WordPress with the Soumettre.fr plugin, this vulnerability could allow unauthorized modification of content managed by the plugin, potentially leading to misinformation, defacement, or manipulation of posts. While the impact on confidentiality and availability is negligible, the integrity of published content can be compromised. This could affect organizations relying on Soumettre.fr for critical communications or public-facing content, including media outlets, government agencies, and businesses. The risk is mitigated if the plugin is properly configured with the API key connected. However, organizations with incomplete setups or legacy installations may be exposed. The impact is more reputational than operational but could lead to loss of trust or misinformation dissemination. Since no exploits are known in the wild, the immediate risk is low, but the vulnerability should be addressed proactively to prevent future exploitation.

European organizations should verify that all installations of the Soumettre.fr plugin have the soumettre account properly connected with a valid API key. This configuration step is critical to prevent unauthorized access. Administrators should audit their WordPress environments to identify any instances of the plugin running without the API key and either complete the setup or disable the plugin until properly configured. Monitoring for unusual activity related to Soumettre posts is recommended to detect potential exploitation attempts. Since no patch is currently linked, organizations should follow vendor communications for updates and apply patches promptly once available. Additionally, implementing web application firewalls (WAFs) with rules to detect and block unauthorized access attempts to the plugin endpoints can provide an additional layer of defense. Regular security reviews and plugin updates should be part of the maintenance routine to avoid similar misconfigurations.