CVE-2025-9376 in Block Bad Bots and Stop Bad Bots Crawlers and Spiders and Anti Spam Protection Plugin
Summary
by MITRE • 08/28/2025
The Block Bad Bots and Stop Bad Bots Crawlers and Spiders and Anti Spam Protection plugin for WordPress is vulnerable to unauthorized access of data due to an insufficient capability check on the 'stopbadbots_check_wordpress_logged_in_cookie' function in all versions up to, and including, 11.58. This makes it possible for unauthenticated attackers to bypass blocklists, rate limits, and other plugin functionality.
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Analysis
by VulDB Data Team • 05/08/2026
The Block Bad Bots plugin for WordPress presents a critical authorization flaw that undermines its core security protections against malicious crawlers and spam activities. This vulnerability exists within the 'stopbadbots_check_wordpress_logged_in_cookie' function where the plugin fails to properly validate user capabilities before executing sensitive operations. The insufficient capability check represents a fundamental design flaw that allows unauthenticated attackers to bypass the plugin's intended access controls and security measures. The vulnerability affects all plugin versions up to and including 11.58, indicating a widespread issue that has persisted across multiple releases and likely impacts a substantial portion of WordPress installations using this protection mechanism.
The technical implementation of this flaw stems from the plugin's failure to verify whether the requesting user possesses adequate privileges before processing the cookie validation function. This capability check deficiency creates an unauthorized access vector that enables attackers to manipulate the plugin's behavior without proper authentication. When an attacker exploits this vulnerability, they can effectively circumvent the plugin's blocklists that are designed to prevent malicious bot activity, bypass rate limiting mechanisms that control crawler behavior, and disable other protective functions that the plugin normally enforces. The exploitation of this weakness allows attackers to gain access to functionality that should be restricted to authenticated administrators or legitimate users.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it fundamentally compromises the security posture of WordPress sites relying on this plugin for protection against bad bots and spam. Attackers can leverage this vulnerability to bypass the very protections that the plugin was designed to provide, potentially leading to increased spam activity, unauthorized data access, and other malicious activities that the plugin was intended to prevent. The vulnerability undermines the trust model that the plugin establishes, as it allows unauthenticated users to access and manipulate security controls that should remain protected. This creates a scenario where the security solution becomes a potential attack vector rather than a protective measure, significantly weakening the overall security framework of affected WordPress installations.
Organizations using this plugin should immediately implement mitigation strategies to address the vulnerability, including updating to the latest version where the capability check has been properly implemented. The fix should involve enforcing strict authentication requirements before allowing access to the cookie validation function, ensuring that only authenticated and authorized users can manipulate the plugin's security controls. Additionally, administrators should conduct thorough security audits of their WordPress installations to identify any potential exploitation attempts and implement monitoring solutions that can detect unauthorized access patterns. The vulnerability aligns with CWE-284, which addresses improper access control issues, and represents a clear violation of the principle of least privilege that should govern all security implementations. From an ATT&CK perspective, this vulnerability maps to privilege escalation techniques that attackers can use to bypass security controls and gain unauthorized access to protected resources.