CVE-2025-31923 is a Missing Authorization vulnerability (CWE-862) found in the QuanticaLabs CSS3 Accordions plugin for WordPress. This vulnerability arises due to improperly configured access control mechanisms within the plugin, allowing users with limited privileges (PR:L - privileges required) to perform unauthorized actions that should be restricted. The affected versions include all versions up to 3.0, with no specific version exclusions noted. The vulnerability is exploitable remotely (AV:N - network attack vector) without requiring user interaction (UI:N), and it affects the integrity and availability of the system (I:L/A:L), but not confidentiality (C:N). The CVSS v3.1 base score is 5.4, indicating a medium severity level. The flaw allows an attacker with some level of authenticated access to bypass authorization checks, potentially modifying or disrupting the plugin's functionality or the content it manages. Since the vulnerability is related to access control, it can lead to unauthorized changes that may affect the website's behavior or availability, potentially impacting the site's visitors and administrators. No known exploits are currently reported in the wild, and no patches have been linked yet, which suggests that users should monitor vendor updates closely. The vulnerability is particularly relevant for WordPress sites using the QuanticaLabs CSS3 Accordions plugin, which is commonly used to create collapsible content sections on websites.

For European organizations, this vulnerability poses a moderate risk, especially for those relying on WordPress sites with the QuanticaLabs CSS3 Accordions plugin installed. The impact primarily affects website integrity and availability, which can disrupt user experience and potentially damage organizational reputation. In sectors such as e-commerce, government, education, and media, where WordPress is widely used, unauthorized modifications could lead to misinformation, service disruption, or defacement. Although the confidentiality impact is rated as none, the integrity and availability issues could indirectly affect compliance with data protection regulations like GDPR if service disruptions lead to loss of service or affect user trust. Additionally, organizations with limited IT security resources might be slower to detect and respond to exploitation attempts, increasing the risk of prolonged impact. Since exploitation requires some level of authenticated access, insider threats or compromised user accounts could be leveraged to exploit this vulnerability, emphasizing the need for strong internal access controls and monitoring.

Organizations should take the following specific actions to mitigate this vulnerability: 1) Immediately audit WordPress installations to identify the presence of the QuanticaLabs CSS3 Accordions plugin and verify the version in use. 2) Restrict plugin access permissions strictly to trusted users and roles, minimizing the number of accounts with privileges that could exploit this flaw. 3) Implement robust authentication and session management controls to prevent unauthorized access to accounts with elevated privileges. 4) Monitor website logs and user activity for unusual changes or access patterns related to the plugin's functionality. 5) Stay informed about vendor updates or patches addressing this vulnerability and apply them promptly once available. 6) Consider temporarily disabling or removing the plugin if it is not essential, especially in high-risk environments. 7) Employ web application firewalls (WAFs) with custom rules to detect and block suspicious requests targeting the plugin's endpoints. 8) Conduct regular security assessments and penetration testing focused on WordPress plugins and access control mechanisms to identify similar weaknesses proactively.