CVE-2025-13408 is a Cross-Site Request Forgery (CSRF) vulnerability identified in the Foxtool All-in-One WordPress plugin, which provides features such as a contact chat button, custom login, and media image optimization. The vulnerability exists due to missing or incorrect nonce validation in the foxtool_login_google() function, which handles OAuth connection establishment. Nonce validation is a security mechanism designed to ensure that requests originate from legitimate users and not from forged sources. Because this validation is absent or flawed, an attacker can craft a malicious link that, when clicked by a site administrator, triggers an unauthorized OAuth connection setup without the administrator's explicit consent. This attack vector requires no prior authentication but does require user interaction (clicking the malicious link). The vulnerability affects all versions up to and including 2.5.2 of the plugin. The CVSS v3.1 base score is 4.3, reflecting a medium severity level, with the vector indicating network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, no confidentiality impact, low integrity impact, and no availability impact. While no public exploits are known at this time, the vulnerability could be leveraged to establish unauthorized OAuth connections, potentially enabling attackers to escalate privileges or perform further malicious actions within the compromised WordPress environment. The lack of a patch link suggests that a fix may not yet be publicly available, emphasizing the need for immediate mitigation steps by affected users.

For European organizations, this vulnerability poses a risk primarily to the integrity of WordPress sites using the Foxtool All-in-One plugin. Unauthorized OAuth connections could allow attackers to gain elevated access or manipulate authentication flows, potentially leading to unauthorized actions or further compromise of the website. This could impact organizations relying on WordPress for customer interaction, internal communications, or content management, especially those with administrators who might be targeted via phishing or social engineering to click malicious links. While confidentiality and availability are not directly impacted, the integrity breach could undermine trust in the affected services, lead to reputational damage, and potentially expose organizations to regulatory scrutiny under GDPR if personal data is indirectly compromised through subsequent attacks. The medium severity score indicates a moderate risk that should be addressed promptly to prevent exploitation.

1. Immediately update the Foxtool All-in-One plugin to the latest version once a patch is released by the vendor to address the nonce validation issue. 2. Until a patch is available, implement Web Application Firewall (WAF) rules to detect and block suspicious requests targeting the foxtool_login_google() function or unusual OAuth connection attempts. 3. Educate WordPress administrators about the risk of clicking unsolicited or suspicious links, especially those received via email or messaging platforms, to reduce the likelihood of successful social engineering. 4. Review and restrict OAuth permissions and connected applications within the WordPress environment to minimize potential damage from unauthorized connections. 5. Monitor WordPress logs for unusual OAuth connection activities or unexpected administrative actions. 6. Consider temporarily disabling the affected plugin features if feasible, especially the custom login or OAuth-related functionalities, until a secure version is available. 7. Employ multi-factor authentication (MFA) for WordPress administrator accounts to add an additional security layer against unauthorized access.