CVE-2025-29012 is a medium-severity vulnerability classified under CWE-862 (Missing Authorization) affecting the kamleshyadav CF7 7 Mailchimp Add-on, a plugin that integrates Contact Form 7 (CF7) with Mailchimp services. The vulnerability arises due to improperly configured access control mechanisms, allowing unauthorized users to exploit the add-on's functionality without proper authorization checks. Specifically, the flaw permits attackers to perform actions that should be restricted, potentially leading to unauthorized modification of data or configuration within the add-on. The CVSS 3.1 base score is 5.3, reflecting a network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The impact is limited to integrity (I:L), with no confidentiality (C:N) or availability (A:N) impact. This means attackers can alter data or settings but cannot access confidential information or disrupt service availability. The vulnerability affects all versions up to 2.2, with no patch currently available. No known exploits are reported in the wild as of the publication date (July 4, 2025). The missing authorization issue indicates that the add-on fails to verify whether the requester has the necessary permissions before allowing certain operations, which could be leveraged to manipulate Mailchimp integration settings or data submissions. Given the add-on's role in managing email marketing lists and contact data, unauthorized modifications could lead to data integrity issues, misdirected marketing campaigns, or unauthorized subscription changes.

For European organizations using the CF7 7 Mailchimp Add-on, this vulnerability poses a risk to the integrity of their marketing and customer contact data. Unauthorized changes could lead to corrupted mailing lists, inadvertent subscription of users to campaigns, or manipulation of contact form data flows. While the vulnerability does not directly expose confidential data or cause denial of service, the integrity compromise can undermine trust in marketing communications and potentially violate data protection regulations such as GDPR if user consent or data accuracy is affected. Organizations relying heavily on automated marketing workflows integrated via this add-on may experience operational disruptions or reputational damage if attackers exploit this flaw to alter campaign data. The lack of required privileges and user interaction for exploitation increases the risk, as attackers can remotely exploit the vulnerability without authentication. This is particularly concerning for organizations with public-facing WordPress sites using this add-on. However, the absence of known exploits in the wild suggests that immediate widespread impact is limited, though proactive mitigation is advised.

European organizations should implement the following specific mitigations: 1) Immediately audit all installations of the CF7 7 Mailchimp Add-on to identify affected versions (up to 2.2). 2) Restrict access to WordPress administrative and plugin endpoints via web application firewalls (WAFs) or reverse proxies to trusted IP ranges where feasible, reducing exposure to unauthorized requests. 3) Monitor and log all interactions with the add-on's endpoints to detect anomalous or unauthorized activity indicative of exploitation attempts. 4) Apply principle of least privilege on WordPress user roles, ensuring that only necessary users have administrative or plugin management rights. 5) Until an official patch is released, consider disabling or uninstalling the add-on if it is not critical to operations. 6) Engage with the vendor or community to track patch releases and apply updates promptly once available. 7) Implement additional authorization checks via custom plugins or security modules to enforce access control on the add-on's functionality if feasible. 8) Educate site administrators about the risks and signs of exploitation to enhance detection and response capabilities.