CVE-2025-13527 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the xShare plugin for WordPress, affecting all versions up to and including 1.0.1. The root cause is the absence of nonce validation in the 'xshare_plugin_reset()' function, which is responsible for resetting the plugin's settings. Nonce validation is a security measure that ensures requests are intentional and originate from legitimate users. Without this protection, an attacker can craft a malicious web request that, when visited by a site administrator, triggers the reset function without their explicit consent. This attack vector requires no authentication but does require the administrator to interact with a crafted link or webpage, making social engineering or phishing a likely exploitation method. The impact is limited to integrity, as attackers can alter plugin settings, potentially degrading site functionality or security configurations. Confidentiality and availability are not directly affected. The vulnerability has a CVSS 3.1 base score of 4.3, reflecting its medium severity due to ease of exploitation and limited impact scope. No patches or known exploits are currently documented, but the vulnerability is publicly disclosed and should be addressed promptly. The plugin's widespread use in WordPress sites makes this a relevant concern for web administrators, particularly in environments where the plugin is critical for site operations or security.

For European organizations, this vulnerability poses a moderate risk primarily to the integrity of WordPress sites using the xShare plugin. An attacker exploiting this flaw can reset plugin settings, which may disable security features, alter sharing configurations, or disrupt normal plugin behavior. This can lead to degraded site security posture or operational issues, potentially exposing the site to further attacks or causing downtime. Since exploitation requires administrator interaction, the risk is heightened in environments where administrators are susceptible to phishing or social engineering attacks. Organizations relying heavily on WordPress for their web presence, especially those with sensitive or high-traffic sites, may face reputational damage or operational disruptions. The vulnerability does not directly compromise data confidentiality or availability, but the indirect effects of altered plugin settings could facilitate additional attacks or service interruptions.

1. Monitor for and apply official patches or updates from the xShare plugin vendor as soon as they become available. 2. In the absence of patches, implement manual nonce validation in the 'xshare_plugin_reset()' function to ensure requests are legitimate. 3. Restrict administrative access to trusted networks and use multi-factor authentication to reduce the risk of compromised admin accounts. 4. Educate WordPress administrators about phishing and social engineering tactics to minimize the chance of clicking malicious links. 5. Employ web application firewalls (WAFs) with rules to detect and block suspicious CSRF attempts targeting the plugin’s reset functionality. 6. Regularly audit plugin configurations and logs to detect unauthorized changes promptly. 7. Consider disabling or replacing the xShare plugin if it is not essential or if a secure alternative exists. 8. Implement Content Security Policy (CSP) headers to reduce the risk of malicious external content triggering CSRF attacks.