CVE-2025-15377 is a Cross-Site Request Forgery (CSRF) vulnerability identified in the abage Sosh Share Buttons plugin for WordPress, affecting all versions up to and including 1.1.0. The root cause is the absence of nonce validation in the 'admin_page_content' function, which is responsible for handling plugin settings updates. Nonces in WordPress are security tokens used to verify that requests are intentional and originate from legitimate users. Without this validation, attackers can craft malicious requests that, when executed by an authenticated administrator (e.g., by clicking a specially crafted link), cause unauthorized changes to the plugin's configuration. This vulnerability does not require the attacker to be authenticated, but it does require user interaction, specifically the administrator being tricked into performing an action. The CVSS 3.1 score of 4.3 reflects that the attack vector is network-based, with low attack complexity, no privileges required, but requiring user interaction. The impact is limited to integrity, as confidentiality and availability are not affected. No known exploits have been reported in the wild, but the vulnerability poses a risk to WordPress sites using this plugin, as unauthorized setting changes could lead to further security issues or site misconfigurations. The lack of a patch link indicates that a fix may not yet be available, emphasizing the need for interim mitigations. The vulnerability was reserved at the end of 2025 and published in early 2026, indicating recent discovery and disclosure.

For European organizations, this vulnerability could lead to unauthorized modification of plugin settings on WordPress sites, potentially undermining site security or functionality. Although the direct impact on confidentiality and availability is minimal, integrity compromise could facilitate further attacks or disrupt normal operations. Organizations relying on WordPress for public-facing websites, intranets, or e-commerce platforms may face reputational damage or operational challenges if attackers exploit this vulnerability. Given the widespread use of WordPress across Europe, especially in countries with large digital economies, the risk is non-negligible. Attackers could leverage this vulnerability to alter social sharing behaviors, inject malicious content indirectly, or weaken site defenses. The requirement for administrator interaction means that phishing or social engineering campaigns could be a vector, increasing the risk to organizations with less mature security awareness programs. The absence of known exploits suggests a window of opportunity for defenders to act before widespread exploitation occurs.

Immediate mitigation steps include restricting administrative access to trusted networks or VPNs to reduce exposure to CSRF attacks. Administrators should be trained to recognize phishing attempts and avoid clicking on suspicious links, especially those received via email or messaging platforms. Implementing web application firewalls (WAFs) with rules to detect and block CSRF attempts targeting the plugin's administrative endpoints can provide additional protection. Site operators should monitor for unusual changes in plugin settings or unexpected administrative actions. Until an official patch is released, consider disabling or removing the Sosh Share Buttons plugin if it is not critical to operations. Developers or site maintainers can implement custom nonce validation in the plugin's 'admin_page_content' function as a temporary fix. Regular backups of site configurations and content should be maintained to enable recovery if unauthorized changes occur. Finally, stay informed about updates from the plugin vendor and apply patches promptly once available.