Limit Login Attempts Reloaded Authentication Bypass

Executive Summary

This vulnerability affects the Limit Login Attempts Reloaded WordPress plugin before version 3.3.5. It allows attackers to bypass the username denylist by exploiting case sensitivity or using the account's email address. The plugin fails to perform case-insensitive checks on the denylist, enabling attackers with valid credentials for a blocked account to log in despite the administrator's block.

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Detection Guidance

Check the installed version of the Limit Login Attempts Reloaded plugin in your WordPress admin panel. If the version is below 3.3.5, the vulnerability is present. Review login logs for failed attempts or unusual activity from blocked accounts.

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Impact Analysis

If you use the vulnerable plugin version, an attacker with valid credentials for a denylisted account could bypass the block and log in. This undermines the intended security measure but does not grant unauthorized access. Exploitation requires prior knowledge of valid credentials for the blocked account.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR or HIPAA as it does not involve unauthorized data access or disclosure. However, it could indirectly impact compliance by weakening access controls, which are critical under both standards for protecting personal and health data.

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Mitigation Strategies

Update the Limit Login Attempts Reloaded plugin to version 3.3.5 or later immediately. Verify that the denylist is functioning correctly by testing blocked accounts. Monitor login attempts for any bypass attempts.

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