CVE-2025-58806 is a high-severity security vulnerability classified as a Cross-Site Request Forgery (CSRF) issue affecting the WordPress Error Monitoring plugin by Bugsnag, developed by imjoehaines. This vulnerability exists in versions up to and including 1.6.3. The core problem arises because the plugin does not adequately verify the authenticity of requests made to it, allowing an attacker to trick an authenticated WordPress administrator into executing unwanted actions without their consent. Exploiting this CSRF flaw can lead to Stored Cross-Site Scripting (XSS), where malicious scripts are permanently injected into the plugin’s data or WordPress environment. The CVSS 3.1 base score of 7.1 reflects the vulnerability’s network attack vector, low attack complexity, no privileges required, but requiring user interaction (the victim must be logged in and visit a malicious page). The scope is changed, meaning the vulnerability affects resources beyond the initially vulnerable component. The impact includes partial confidentiality, integrity, and availability loss, as the attacker can execute arbitrary scripts in the context of the victim’s browser session. This can lead to session hijacking, privilege escalation, or further compromise of the WordPress site. No known exploits are currently reported in the wild, and no patches have been linked yet, indicating a window of exposure for affected installations. The vulnerability is rooted in CWE-352, highlighting insufficient anti-CSRF protections in the plugin’s request handling.

For European organizations using WordPress with the Bugsnag Error Monitoring plugin, this vulnerability poses a significant risk. Many European businesses, government agencies, and NGOs rely on WordPress for their web presence and may use monitoring plugins like Bugsnag to track errors. Successful exploitation could allow attackers to inject malicious scripts, potentially leading to data theft, unauthorized administrative actions, or defacement. This undermines the confidentiality and integrity of sensitive data and could disrupt service availability. Given the plugin’s role in error monitoring, attackers might also manipulate error logs or monitoring data to hide their activities. The impact is particularly critical for organizations subject to strict data protection regulations such as GDPR, as exploitation could lead to data breaches and regulatory penalties. Additionally, the requirement for user interaction means targeted phishing or social engineering campaigns could be used to trigger the exploit, increasing the threat surface. The absence of patches increases the urgency for mitigation.

European organizations should immediately audit their WordPress installations to identify the presence and version of the WordPress Error Monitoring by Bugsnag plugin. Until an official patch is released, the following specific mitigations are recommended: 1) Disable or uninstall the vulnerable plugin to eliminate the attack vector. 2) Implement Web Application Firewall (WAF) rules to detect and block suspicious CSRF attempts targeting the plugin’s endpoints. 3) Enforce strict Content Security Policy (CSP) headers to reduce the impact of potential XSS payloads. 4) Educate administrators and users to avoid clicking on suspicious links or visiting untrusted websites while logged into WordPress. 5) Monitor logs for unusual administrative actions or error monitoring data anomalies that could indicate exploitation attempts. 6) Prepare to apply vendor patches promptly once available and test updates in a staging environment before production deployment. 7) Consider deploying multi-factor authentication (MFA) for WordPress admin accounts to reduce the risk of session hijacking.