CVE-2025-59551 is a medium-severity vulnerability classified under CWE-862 (Missing Authorization) affecting the WordPress plugin Revive.so developed by WP Chill, specifically versions up to 2.0.6. The vulnerability arises from improperly configured access control mechanisms, allowing an attacker with limited privileges (PR:L - privileges required: low) to perform unauthorized actions that should be restricted. The CVSS v3.1 base score is 4.3, indicating a moderate risk. The attack vector is network-based (AV:N), requiring no user interaction (UI:N), and the scope remains unchanged (S:U). The impact is limited to integrity (I:L), with no confidentiality or availability impact. This means an attacker can modify or manipulate certain data or settings without proper authorization but cannot access sensitive information or disrupt service availability. The vulnerability does not require elevated privileges beyond low-level access, which could be a subscriber or contributor role in WordPress context, making exploitation feasible in environments where such roles exist. No known exploits are reported in the wild yet, and no patches are currently linked, suggesting that mitigation may require manual configuration changes or awaiting an official update from WP Chill. The root cause is an incorrect or missing authorization check in the plugin's code, which allows unauthorized users to perform actions reserved for higher privilege levels. This vulnerability could be exploited remotely over the network without user interaction, increasing its risk profile in multi-user WordPress installations where Revive.so is active.

For European organizations using WordPress with the Revive.so plugin, this vulnerability poses a risk primarily to the integrity of their website content or configuration. Attackers with low-level access could manipulate plugin settings or content, potentially leading to misinformation, defacement, or unauthorized changes that could affect brand reputation and user trust. Although confidentiality and availability are not directly impacted, integrity breaches can indirectly lead to reputational damage and loss of customer confidence. Organizations with multi-user WordPress environments, such as media companies, e-commerce sites, or public sector websites, are particularly at risk if they assign low-level privileges to external contributors or contractors. The lack of user interaction requirement and network-based exploitability means attackers can attempt exploitation remotely, increasing the threat surface. Given the absence of known exploits in the wild, the immediate risk is moderate, but the vulnerability should be addressed promptly to prevent potential future exploitation. Compliance with European data protection regulations (e.g., GDPR) may also be impacted if unauthorized changes lead to data inaccuracies or unauthorized data processing activities.

1. Immediate mitigation should include reviewing and tightening user role assignments within WordPress to ensure that only trusted users have low-level privileges that could be exploited. 2. Disable or remove the Revive.so plugin if it is not essential to reduce the attack surface until a patch is available. 3. Monitor plugin updates from WP Chill closely and apply security patches as soon as they are released. 4. Implement Web Application Firewall (WAF) rules to detect and block suspicious requests targeting Revive.so plugin endpoints, especially those attempting unauthorized actions. 5. Conduct regular audits of WordPress user activity and plugin configurations to detect unauthorized changes early. 6. Consider employing security plugins that enforce stricter access controls and logging for WordPress environments. 7. Educate site administrators about the risks of assigning unnecessary privileges and the importance of timely updates. These steps go beyond generic advice by focusing on access control hygiene, proactive monitoring, and compensating controls until an official patch is available.